The Flock!!!(superb jazz prog)
The Flock - Dinosaur Swamps(1970)
This wonderful fusion of jazz-rock, americana and progressive simply "rocks" even if you don't particularly go for any of the genres.
The Flock - Inside Out(1975)
This band from Chicago mix rather complex (and at times chaotic) progressive rock sound with funk and jazz influences for a mostly pretty good affair. The opening piece on each side is also the worst song, but tunes like "Back To You" and the stoner anthem "My OK Today"