Donald Macleod explores the life and music of the Italian violinist and composer Arcangelo Corelli. He discovers how, although Corelli has established himself as Rome's hottest musical property, the 'affair of the fifths' threatens to ruin his hard-won reputation. Sonata, Op 1 No 1 Accademia Bizantina: Carlo Chiarappa (violin) Franco Andrini (violin) Mauro Valli (cello) Romano Valentini (organ) Paolo Cherici (archlute) Europa Musica 350202, CD1 Trs 1-4 Sonata, Op 2 No 4 London Baroque: Ingrid Seifert, Richard Gwilt (violins) Charles Medlam (cello) Lars Ulrik Mortensen (harpsichord) Harmonia Mundi HMC90134243, CD1, Trs 12-16 Sonata, Op 2 No 3 Purcell Quartet Chandos CHAN0692, CD2 Trs 8-11 Sonata, Op 3 No 1 (arr. Roland Gallery) English Guitar Quartet Saydisc CDSDL386, Trs 9-12 Sonata in G, Op 3 No 6 Ensemble Aurora Enrico Gatti (director) Arcana A402, CD1 Trs 9-12 Concerto grosso, Op 6 No 5 Brandenburg Consort Roy Goodman (director) Hyperion CDA667412, CD1 Trs 21-25.