Isaac Stern's 60th birthday concert with Pinchas Zukerman and Itzhak Perlman, Zubin Menta conducting. Bach's double concerto, and unheralded Vivaldi triple concerto, and Mozart's triumphant synfonia concertante in e flat.
Yo yo ma, Bach's cello sonatas, especially the prelude.
Itzhak Perlman, Paganini's caprices
Amadeus sound track
Yo yo ma, itzhak Perlman, Emmanuel Ax and some other guy I can't remember, Brahms quartets
Kodaly Quartet, Haydn, Opus 76, #4 Sunrise string quartet
Andres Segovia the art of Segovia
Brandenburg by the Bach German soloists.
I could go on here...