Felix Ayo Losada (1 July 1933 – 24 September 2023) was a Spanish-born Italian violinist. He was a founder of the Italian ensemble I Musici and of the Quartetto Beethoven di Roma. He played in major co
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe477f65f6615dc180980de466d302ac5a46ef3c10cc2fa790ecbf6d9bbdf5227. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/139fd9c0-add5-468a-a518-346e5bc56b8f.json and https://artists.proofprofile.net/proofs/artist/139fd9c0-add5-468a-a518-346e5bc56b8f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brandenburg Concerto No. 1 in F Major, BWV 1046: I. Allegro
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
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Brandenburg Concerto No. 4 in G Major, BWV 1049: I. Allegro
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Brandenburg Concerto No. 1 in F Major, BWV 1046: II. Adagio
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Brandenburg Concerto No. 4 in G Major, BWV 1049: II. Andante
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Brandenburg Concerto No. 1 in F Major, BWV 1046: III. Allegro
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Brandenburg Concerto No. 4 in G Major, BWV 1049: III. Presto
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Brandenburg Concerto No. 1 in F Major, BWV 1046: IV. Menuetto
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Brandenburg Concerto No. 5 in D Major, BWV 1050: I. Allegro
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Brandenburg Concerto No. 2 in F Major, BWV 1047: I. Allegro
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Brandenburg Concerto No. 5 in D Major, BWV 1050: II. Affettuoso
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Brandenburg Concerto No. 2 in F Major, BWV 1047: II. Andante
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Brandenburg Concerto No. 5 in D Major, BWV 1050: III. Allegro
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Brandenburg Concerto No. 2 in F Major, BWV 1047: III. Allegro assai
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. Allegro
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Brandenburg Concerto No. 3 in G Major, BWV 1048: I. Allegro
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: II. Adagio
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: III. Allegro
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Brandenburg Concerto No. 3 in G Major, BWV 1048: III. Allegro
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Concertino for Strings No. 1 in G Major: I. Grave - II. Allegro
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Concertino for Strings No. 1 in G Major: III. Grave
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Concertino for Strings No. 1 in G Major: IV. Allegro
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Concertino for Strings No. 2 in G Major: I. Largo - II. Non presto
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Concertino for Strings No. 2 in G Major: III. Andante affettuoso
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Concertino for Strings No. 2 in G Major: IV. Allegro
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Concerto No. 1 « Spring » RV 269 in E Major - I. Allegro - Remastered 2022, Version 1959
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Concerto No. 1 « Spring » RV 269 in E Major - II. Largo e pianissimo sempre - Remastered 2022, Version 1959
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Concerto No. 1 « Spring » RV 269 in E Major - III. Allegro: Danza pastorale - Remastered 2022, Version 1959
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Concerto No. 2 « Summer » RV 315 in G minor - I. Allegro non molto - Remastered 2022, Version 1959
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Concerto No. 2 « Summer » RV 315 in G minor - II. Adagio, Presto - Remastered 2022, Version 1959
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Concerto No. 2 « Summer » RV 315 in G minor - III. Presto: Tempo impetuoso d’Estate - Remastered 2022, Version 1959
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Concerto No. 3 « Autumn » RV 293 in F Major - I. Allegro: Ballo e canto de’ Villanelli - Remastered 2022, Version 1959
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Concerto No. 4 « Winter » RV 297 in F minor - I. Allegro non molto - Remastered 2022, Version 1959
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Concerto No. 4 « Winter » RV 297 in F minor - II. Largo - Remastered 2022, Version 1959
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Flute Concerto No. 1 in F Major, Op. 10 No. 1 RV 433 "La tempesta di mare": II. Largo
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Violin Concerto in E-Flat Major, Op. 8 No. 5, RV 253 "La tempesta di mare": II. Largo
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Vivaldi: The Four Seasons & L'amoroso (2017 Digital Remaster)
The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
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Antonio Lucio Vivaldi: Las Cuatro Estaciones
Viotti: Violin Sonatas (Complete), Vol. 3
Viotti: Violin Sonatas (Complete), Vol. 2
Vivaldi: Concertos pour violon "Il sospetto", "L'inquietudine", "L'amoroso" & "Il riposo" (Stereo Version)
Mendelssohn, Felix: Violin Concerto in D Minor / Concerto for Violin and Piano
Albinoni: The Complete Concertos/Adagio for Organ & Strings
Concerto a 5 in D, Op. 9, No. 7 for Violin, Strings, and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in B flat, Op. 9, No. 1 for Violin, Strings, and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in D, Op. 9, No. 7 for Violin, Strings, and Continuo - Rev. Giegling: 2. Andante e sempre piano
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Concerto a 5 in B flat, Op. 9, No. 1 for Violin, Strings, and Continuo - Rev. Giegling: 2. Adagio
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Concerto a 5 in D, Op. 9, No. 7 for Violin, Strings, and Continuo - Rev. Giegling: 3. Allegro
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Concerto a 5 in B flat, Op. 9, No. 1 for Violin, Strings, and Continuo - Rev. Giegling: 3. Allegro
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Oboe Concerto in G Minor, Op. 9 No. 8: I. Allegro
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Oboe Concerto in D Minor, Op. 9 No. 2: I. Allegro e non presto
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Oboe Concerto in G Minor, Op. 9 No. 8: II. Adagio
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Oboe Concerto in D Minor, Op. 9 No. 2: II. Adagio
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Oboe Concerto in G Minor, Op. 9 No. 8: III. Allegro
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Oboe Concerto in D Minor, Op. 9 No. 2: III. Allegro
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Concerto for 2 Oboes in C Major, Op. 9 No. 9: I. Allegro
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Concerto for 2 Oboes in F Major, Op. 9 No. 3: I. Allegro
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Concerto for 2 Oboes in C Major, Op. 9 No. 9: II. Adagio, non troppo
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Concerto for 2 Oboes in F Major, Op. 9 No. 3: II. Adagio
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Concerto for 2 Oboes in C Major, Op. 9 No. 9: III. Allegro
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Concerto for 2 Oboes in F Major, Op. 9 No. 3: III. Allegro
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Concerto a 5 in F, Op. 9, No. 10 for Violin, Strings, and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in A ,Op. 9, No. 4 for Violin, Strings, and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in A ,Op. 9, No. 4 for Violin, Strings, and Continuo - Rev. Giegling: 2. Adagio
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Concerto a 5 in F, Op. 9, No. 10 for Violin, Strings, and Continuo - Rev. Giegling: 2. Adagio
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Concerto a 5 in A ,Op. 9, No. 4 for Violin, Strings, and Continuo - Rev. Giegling: 3. Allegro
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Concerto a 5 in F, Op. 9, No. 10 for Violin, Strings, and Continuo - Rev. Giegling: 3. Allegro
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Concerto a 5 in C Major, Op. 9, No. 5 for Oboe, Strings, and Continuo: 1. Allegro
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Concerto a 5 in B-Flat Major, Op. 9, No. 11 for Oboe, Strings, and Continuo: 1. Allegro
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Concerto a 5 in C Major, Op. 9, No. 5 for Oboe, Strings, and Continuo: 2. Adagio
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Concerto a 5 in B-Flat Major, Op. 9, No. 11 for Oboe, Strings, and Continuo: 2. Adagio
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Concerto a 5 in C Major, Op. 9, No. 5 for Oboe, Strings, and Continuo: 3. Allegro
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Concerto a 5 in B-Flat Major, Op. 9, No. 11 for Oboe, Strings, and Continuo: 3. Allegro
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Concerto a 5 in G, Op. 9, No. 6 for 2 Oboes, Strings, and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in D, Op. 9, No. 12 for 2 Oboes, Strings,and Continuo - Rev. Giegling: 1. Allegro
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Concerto a 5 in G, Op. 9, No. 6 for 2 Oboes, Strings, and Continuo - Rev. Giegling: 2. Adagio
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Concerto a 5 in D, Op. 9, No. 12 for 2 Oboes, Strings,and Continuo - Rev. Giegling: 2. Adagio
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Concerto a 5 in G, Op. 9, No. 6 for 2 Oboes, Strings, and Continuo - Rev. Giegling: 3. Allegro
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Concerto a 5 in D, Op. 9, No. 12 for 2 Oboes, Strings,and Continuo - Rev. Giegling: 3. Allegro
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Concerto for Violin and Strings in D minor , Op. 8/7 , RV 242: 1. Allegro
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Violin Concerto in E Major, Op. 8, No. 1, RV 269 "La primavera": II. Largo
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Violin Concerto in G Minor, Op. 8, No. 2, RV 315 "L'estate": I. Allegro non molto - Allegro
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Violin Concerto in G Minor, Op. 8, No. 2, RV 315 "L'estate": III. Presto. Tempo impetuoso d'estate
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Concerto for Violin and Strings in F minor, Op. 8, No. 4, RV 297 "L'inverno": 1. Allegro non molto
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Concerto for Violin and Strings in B flat , Op. 8/10 , RV 362 "La caccia": 2. Adagio
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Concerto for Violin and Strings in E flat, Op. 8/5 , RV 253 "La tempesta di mare": 1. (Allegro e) presto
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Concerto for Violin and Strings in E flat, Op. 8/5 , RV 253 "La tempesta di mare": 2. Largo
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Handel: Concerto grosso, Op. 6 No. 4 - Bach: Concerto pour piano No. 5 - Haydn: Concerto pour violon, Hob. VIIa:1 (Stereo Version)
Handel: Concerto grosso, Op. 6 No. 4 - Bach: Concerto pour piano No. 5 - Haydn: Concerto pour violon, Hob. VIIa:1 (Mono Version)
Concerto for Oboe and Strings in B flat , Op. 7/1 , RV 465: 1. Allegro
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Concerto for Oboe and Strings in B flat , Op. 7/1 , RV 465: 2. Adagio
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Concerto for Oboe and Strings in B flat , Op. 7/7 , RV 464: 3. Allegro
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Concerto for Violin and Strings in C , Op. 7/2 , RV 188: 1. Allegro
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Concerto for Violin and Strings in G , Op. 7/8 , RV 299: 1. Allegro assai
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Concerto for Violin and Strings in C , Op. 7/2 , RV 188: 2. Largo
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Concerto for Violin and Strings in G , Op. 7/8 , RV 299: 2. Largo, cantabile
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Concerto for Violin and Strings in C , Op. 7/2 , RV 188: 3. Allegro
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Concerto for Violin and Strings in G , Op. 7/8 , RV 299: 3. Allegro
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Concerto for Violin and Strings in G minor , Op. 7/3 , RV 326: 1. Allegro
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Concerto for Violin and Strings in G minor , Op. 7/3 , RV 326: 2. Grave
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Concerto for Violin and Strings in G minor , Op. 7/3 , RV 326: 3. Presto
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Concerto for Violin and Strings in A minor , Op. 7/4 , RV 354: 1. Allegro
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Concerto for Violin and Strings in A minor , Op. 7/4 , RV 354: 2. Adagio
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Concerto for Violin and Strings in A minor , Op. 7/4 , RV 354: 3. Allegro
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Concerto for Violin and Strings in F , Op. 7/5 , RV 285a: 1. Allegro
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Concerto for Violin and Strings in D , Op. 7/11 , RV 208a: 1. Allegro
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Concerto for Violin and Strings in B flat , Op. 7/6 , RV 374: 2. Largo
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Concerto for Violin and Strings in B flat , Op. 7/6 , RV 374: 3. Allegro
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 1. Preludio: Largo
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 2. Allemanda: Allegro
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 3. Corrente: Vivace
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 4. Gavotta: Allegro
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 5. Adagio
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Concerto grosso in F, Op. 6, No. 9 - Rev. Vittorio Negri (1923 - ): 6. Minuetto: Vivace
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 9 in B flat major: 1. Allegro
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 9 in B flat major: 2. Largo e spiccato
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 9 in B flat major: 3. Allegro
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 10 in G major, RV300: 1. Allegro molto
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 10 in G major, RV300: 2. Largo cantabile
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 10 in G major, RV300: 3. Allegro
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 11 in C minor, RV198a: 1. Allegro
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 11 in C minor, RV198a: 2. Adagio
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12 Violin Concertos, Op. 9 - "La cetra" / Concerto No. 11 in C minor, RV198a: 3. Allegro
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Concerto grosso in D, Op. 6, No. 1 - Rev. Vittorio Negri (1923- ): 1 Largo - Allegro
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Concerto grosso in D, Op. 6, No. 1 - Rev. Vittorio Negri (1923- ): 2. Largo - Allegro
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Concerto grosso in D, Op. 6, No. 1 - Rev. Vittorio Negri (1923- ): 3. Largo
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Concerto grosso in D, Op. 6, No. 1 - Rev. Vittorio Negri (1923- ): 4. Largo
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Concerto grosso in D, Op. 6, No. 1 - Rev. Vittorio Negri (1923- ): 5. Allegro
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Concerto grosso in F, Op. 6, No. 2 - Rev. Vittorio Negri (1923- ): 1. Vivace - Allegro - Adagio - Vivace - Allegro - Largo andante
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Concerto grosso in F, Op. 6, No. 2 - Rev. Vittorio Negri (1923- ): 2. Allegro
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Concerto grosso in F, Op. 6, No. 2 - Rev. Vittorio Negri (1923- ): 3. Grave - Andante largo
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Concerto grosso in F, Op. 6, No. 2 - Rev. Vittorio Negri (1923- ): 4. Allegro
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 1. Preludio (Andante largo)
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 2. Allemanda (Allegro)
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 3. Adagio
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 4. Corrente (Vivace)
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 5. Allegro
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Concerto grosso in C, Op. 6, No. 10 - Rev. by Vittorio Negri (1923 - ): 6. Minuetto (Vivace)
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Violin Concerto in E major, RV 271 "L'amoroso": 1. Allegro
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Violin Concerto in E major, RV 271 "L'amoroso": 2. Cantabile
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Violin Concerto in E major, RV 271 "L'amoroso": 3. Allegro
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Violin Concerto in E Major, Op. 8, No. 1, RV 269 "La primavera": I. Allegro
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Violin Concerto in E Major, Op. 8, No. 1, RV 269 "La primavera": III. Allegro (Danza pastorale)
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Violin Concerto in G Minor, Op. 8, No. 2, RV 315 "L'estate": II. Adagio - Presto - Adagio
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Concerto for Violin and Strings in F major, Op. 8, No. 3, RV 293 "L'autunno": 1. Allegro (Ballo, e canto de' villanelli)
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Concerto for Violin and Strings in F major, Op. 8, No. 3, RV 293 "L'autunno": 2. Adagio molto (Ubriachi dormienti)
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Concerto for Violin and Strings in F major, Op. 8, No. 3, RV 293 "L'autunno": 3. Allegro (La caccia)
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Concerto for Violin and Strings in F Minor, Op. 8, No. 4, RV 297 "L'inverno": 2. Largo
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Masterpieces Presents Antonio Vivaldi: The Four Seasons
Britten: Spring Symphony; Four Sea Interludes; Simple Symphony
Vivaldi: Le Quattro Stagioni (The Four Seasons)
Violin Concerto In A Minor BWV 1041: Allegro
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Turina: Violin Sonatas Nos. 1 and 2 / Sonata Espanola
Viotti: Violin Sonatas (Complete), Vol. 1
Tartini, G.: Violin Concertos, Vol. 3 - D. 12, 67, 78
Tartini, G.: Violin Concertos, Vol. 2 - D. 15, 56, 125
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Concerto for Violin and Strings in F minor, Op. 8, No. 4, RV 297 "L'inverno": 3. Allegro
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Bach, J.S.: Sonatas & Partitas for Solo Violin
Schubert: Rondo, D. 438 & Minuets and Trios, D. 89 - Mendelssohn: Symphony No. 9 (Stereo Version)
Schubert: Rondo for Violin and Strings, D. 438 & Five Minuets With Six Trios, D. 89 - Mendelssohn: String Symphony No. 9, MWV N9 (Mono Version)
Five Minuets with Six Trios, D. 89: No. 1 - Version For String Orchestra
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Vivaldi: Les quatre saisons, Op. 8 (Stereo Version)
Bach: Concertos pour violons, BWV 1041 - 1043 (Mono Version)
Vivaldi: Il cimento dell'armonia e dell'inventione, Op. 8, Concerti Nos. 9 - 12 (Mono Version)
Vivaldi: Il cimento dell'armonia e dell'inventione, Concerti Nos. 5, 6, 7 & 8 (Mono Version)
Concerto grosso in B flat, Op. 6, No. 11 - Rev. Vittorio Negri (1923 - ): 1. Preludio: Andante largo
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