I've been struggling to think of anything from the late 60s and early 70s that is good (IMO) and obscure. .
This is one of my favourite singer/songwriters - sadly, little known. He gave up on the music business and became a repo man (among other things). His American Gothic album is a masterpiece
https://www.youtube.com/watch?v=C3nDUVXdlhQ
One from the 60s, slightly less obscure, but still not a major band. Their first (and only) album is excellent but they broke up over 'musical differences'. This is the opening track - quite unlike anything else around at that time
https://www.youtube.com/watch?v=sb8Q4EHozjU