With CCR, Hendrix, Dylan, and original compositions by Neil Young, the 1980 soundtrack to the Hunter S. Thompson laugh-riot, Where the Buffalo Roam, is classic, classic rock. Bill Murray, aka Mr. Thompson even does a goofy-ass version of Lucy in the Sky With Diamonds. Needless to say, this comp is worthy of any and every Gonzo out there.
The Prudent Groove 
Great soundtrack. Havent seen the movie tho’
It’s classic goofy and worth seeking out, for sure.