Violin/Cello Clasical Music

for best sound quality, stick with channel classics, pentatone, bis (for SACD) and harmonia mundi, ecm and onyx for redbook.

One of my all-time favorite recordings is Slava Rostropovich playing Britten's cello suites 1 & 2. He's good playing anything by Britten, who wrote all his cello compositions with Rostropovich in mind. He also did some great duets with Britten on piano doing Schubert and Schumann. As others have noted above, the sound quality isn't state of the art, but it isn't bad either and you won't care.

Yo Yo Ma "Solo" is excellent. Single-layer SACD, but one of the few (in my experience) that actually show the benefits of high-rez. In-the-room presence.