The Fever Tree had their last gig at Mt Carmel High School in Houston in 1969.  It was not uncommon for bands to play a high school gig even if they had a sizable national audience or a contract at a big record label.  In this case, Fever Tree was about done with UNI (think: the spiral) but owed them one more album, which was to be live.  They gave them this show, but the project got shelved.  This track is their famous San Francisco Girls.