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	Mark Sokol (violin) George Rochberg - String Quartet No. 3 (1972) Mark Sokol (violin) CONCORD STRING QUARTET: Mark Sokol (violin), Andrew Jennings (violin), John Kochanowski (viola), Norman Fischer (cello). Recorded in USA, 1973. (3) George Rochberg - String Quartet No. 4 (1977) Mark Sokol (violin) CONCORD STRING QUARTET: Mark Sokol (violin), Andrew Jennings (violin), John Kochanowski (viola), Norman Fischer (cello). Recorded in USA, 1982. (4) George Rochberg - String Quartet No. 6 (1978) Mark Sokol (violin) CONCORD STRING QUARTET: Mark Sokol (violin), Andrew Jennings (violin), John Kochanowski (viola), Norman Fischer (cello). Recorded in USA, 1982. (2) George Rochberg - String Quartet No. 5 (1978) Mark Sokol (violin) CONCORD STRING QUARTET: Mark Sokol (violin), Andrew Jennings (violin), John Kochanowski (viola), Norman Fischer (cello). Recorded in USA, 1982. (2) Tison Street - String Quartet, 1972 (1972) Mark Sokol (violin) CONCORD STRING QUARTET: Mark Sokol (violin), Andrew Jennings (violin), John Kochanowski (viola), Norman Fischer (cello). Recorded in USA, 1973. (0)