Fat Mattress are primarily known as the just-post-Jimi Hendrix Experience band of Noel Redding, putting out a couple of albums in the late 1960s and early 1970s. The Jimi Hendrix connection was probably responsible for gaining Fat Mattress much of whatever attention they managed to attract. It might have been a double-edged sword, however, as Fat Mattress' music wasn't at all similar to what Redding had played with Hendrix, being in far lighter folk-rock, psychedelic, and early prog rock styles, and integrating plenty of vocal harmonies.
These are photos from concerts where Fat Mattress played, so they may be of other bands that played the concert as well.
Jimi Hendrix / Fat Mattress Apr 27, 1969 Oakland, California, United States Uploaded by Zimtrim
Jimi Hendrix / Cat Mother and the All Night Newsboys / Fat Mattress Apr 20, 1969 Dallas, Texas, United States Uploaded by Zimtrim