The Omega Guitar Quartet, in its third incarnation, sans founding members Gilbert Biberian or Greg Pikler. The Quartet was instrumental in commissioning works from new composers and putting guitar ensemble on the 20th century guitar map.
When the Omega Quartet was formed in 1969, chamber music for guitars alone was scarce.
Biberian founded the Omega Players, out of which grew the quartet.
Here’s an article in Creative Guitar International on Biberian and the quartet.
As ever, thanks to selftaughtgirl