A question too difficult to answer. But I'll list a few: Middle and Late Beethoven quartets; Mahler and Bruckner adagios (adagietos); Wagner Tristan and Isolde; Schubert and Brahms Lieder; Sibelius 6 and 7, certainly the Barber adagio; Sibelius and Bruch vln. concerto; Brahms vln and clarinet sonatas; Dvorak cello con.; Brahms Requiem; Ravel and Debussy quartets; Bach cello suites; Bach violin sonatas & Partitas; Mozart Sinfonia concertante; and much much more. Also; many film scores and a number of popular songs. Picking only three would be too great a sin of omission.
