I'd second the Borodin Quartet. I have a recording on BBC Music (one of the BBC Legends series) that includes two other great string quartet's, one by Borodin (String quartet No. 2) and the other by Ravel (String Quartet in F). They are from live performances at the Leigh Town Hall for the Edinburgh Festival in 1962. The recording was remastered in 20-bit and is an original (analog) mono recording. The recording is OK, the performances are GREAT. The other two on this disc are much lighter in comparison to the Shostakovich, but then again, I'd say most are!
Marco
Marco