Fever Tree is a former American psychedelic rock band of the 1960s, chiefly known for their anthemic 1968 hit, "San Francisco Girls (Return of the Native)". Their fifteen minutes of fame arrived when their song "San Francisco Girls (Return of the Native)" reached #91 in the U.S. on the Billboard Hot 100 chart in June 1968. Like most of the band's material, it was written by the couple of Scott and Vivian Holtzman, who also were their producers. This four-minute track captured all the band's trademarks: Dennis Keller's incantation-like vocals, the quick shifting between slow parts with an almost sacral feeling and faster, more rock-oriented parts, and especially the searing guitar work by Michael Knust.