In music, what is the name of an ensemble of four singers or instrumental performers?

The cast is Phillip Seymour Hoffman, Christopher Walken, Catherine Keener, and Mark Ivanir. The movie is Performance.

SQinfoNUTS, Walken is a talented dancer as well.

Bambi the dear, I believe it may indeed be Christopher Walken in that photograph. Quite a versatile man. The lesson for us is this keep trying new things I keep getting better with the things you're good at.

Love stringed instrument chamber music. I close my eyes and go to a different place

the movie is a late quartet

Jo, not Kim Kardashian nor Robert De Niro

Jo, I see Hoffman & Walken, but don't recognize the others. Doesn't look like Kardashian & DeNiro to me.

I'm pretty sure, but who are man & woman at left & right?

JezzerLX, John Tuturro

Bambi the dear, I was thinking the same thing. must be