Early-music ensembles Sequentia, Altramar, Hilliard Ensemble, Anonymous 4, Tallis Scholars, La Chapelle Royale, and Les Arts Florissants.Singers Paul Hillier, Ellen Hargis, Emma Kirkby, Maria Callas, Christa Ludwig, Luciano Pavarotti, Dietrich Fischer-Dieskau, Peter Pears, and Bethany Beardslee.Harpsichordists Gustav Leonhardt and Trevor Pinnock.Pianists Mitsuko Uchida, Rudolf Serkin, Vladimir Ashkenazy, and Pierre-Laurent Aimard.Orchestras Berlin Philharmonic, Orchestre Revolutionnaire et Romantique, Vienna Philharmonic, New York Philharmonic, San Francisco Symphony, Concertgebouw Orchestra, and London Symphony Orchestra.Opera companies La Scala of Milan, Bayreuth Festival Opera, Kirov Opera, and Royal Opera House at Covent Garden.Chamber ensembles the Tokyo String Quartet, Guarneri String Quartet, and Beaux Arts Trio.Jazz artists Louis Armstrong, Duke Ellington, Charlie Parker, and Dizzy Gillespie.