After finding Juliet of the Spirits, I realised that I never see anything on this label. Nugent, and the Amboy Dukes were on this label. Tough label to find.

Big Brother & The Holding Co. (Janis Joplin) first album was on Mainstream too.
The re-issue was on Columbia, but the Mainstream artwork was left intact.

I can't find anything about this label. Only a modern version. The search is to vast.

My favorite on this label is Bohemian Vendetta's self-titled album released in 1968. One of the best snotty, NYC-style acid-punk rock albums I have heard.