This the Chilean composer Gustavo Becerra's String Quartet #4.

The second movement has an unsusual color contrast in which the first violin plays bowing over the fingerboard, the second violin bows at the bridge, the viola plays normally and the cello has a mute.

The recording is taken from an lp (Oly102). The engineer was Glenn White.

It was played by the Philadelphia String Quartet, which at the time of the recording comprised:

Veda Reynolds and Irwin Eisenberg, violins; Alan Iglitzin, cello; and Charles Brennand. cello.