Tangents in Jazz by the Jimmy Giuffre Four.
Picked up a beautiful M- copy recorded in 1955, released in 56. This is really good jazz. Giuffre was experimenting with a sound that wasn't percussion beat driven, allowing two horns or horn and clarinett to drive most of the music with bass and drums filling in spaces. I've got to say, this is a very Cool sound.
Don't think it's available in stereo, but look for it!