Here's one probably no one else knows. In 1976, Alan Rudolph directed a very Altman-esque film starring Keith Carradine, Harvey Keitel, Sissy Spacek, Lauren Hutton etc entitled "Welcome to L.A."  It has a terrific soundtrack by Richard Baskin (who wrote one of Streisand's big hits, wrote a few numbers for Altman's classic "Nashville" and is an heir to the ice cream fortune).

I love this soundtrack...only have it on vinyl; it's probably next to impossible to find.  Alas.