There are 3 bands of this name: 1. Formed in 1970 around ex-Deep Purple bassist Nick Simper, Warhorse were understandably close to early Deep Purple in their blend of keyboard-colored progressive rock and early heavy metal. The group coalesced when Simper left Deep Purple in 1969 to lead soul singer Marsha Hunt's backing band, which included Rick Wakeman on keyboards for a while. The backing band formed the nucleus of Warhorse, which recorded a couple of albums for Vertigo in the early 1970s.