The group formed as a power trio with Hammond organ as the main instrument. Their first and only album sold itself through "...compactness, wealth of ideas, forceful lead vocals and complicated arrangements, enriched by pianist Robinson's tasteful use of classical strings which are on display along with spacious keyboard passages at their height in the mold of The Nice." One track, "Laughin' Tackle", includes 16 violins, 6 violas, 6 cellos, and 3 double bass, arranged by Robinson, and a drum solo by Underwood. Underwood remained in close contact with Blackmore, and visited Deep Purple in the studio while they were recording In Rock.
The group split in early 1971. Gustafson formed a new band, Bullet with ex-members of Atomic Rooster.
The band's song "Black Sheep of the Family" was the first track to be recorded by Rainbow, having been rejected for the Deep Purple album Stormbringer.