Vox 3-Vox SVBX-5306 (3 LP's) The Avant-Garde String Quartet in the U.S.A.

Stefan Wolpe: String Quartet (1968/69) 17:24
Earle Brown: String Quartet (1965) 11:53
John Cage: String Quartet in Four Parts (1950) 21:42
George Crumb: Black Angels (Images I) (Thirteen Images from the Dark Land) (1970) 22:47
Lejaren Hiller: String Quartet No.5 (In quarter-tones) (1962) 26:58
Leon Kirchner: Quartet No.3 for String Quartet and Electronic Tape (1967) 18:01
Christian Wolff: Summer (1961) 4:40
Jacob Druckman: String Quartet No.2 (1966) 18:40
Morton Feldman: Structures for String Quartet (1951) 5:56

The Concord String Quartet: Mark Sokol and Andrew Jennings, violin. John Kochanowski, viola. Norman Fischer, cello.

Recorded in 1972. This recording of Cage's Quartet also released on Turnabout TVS-34610. These recordings are currently available on CD: VoxBox 2-5143.
LP released in 1973

Sources: New Albion Discography and Cornell University Library Catalog