Sweet's origins go back to 1965, with UK soul band "Wainwright's Gentlemen", which included drummer Mick Tucker and vocalist Ian Gillan. The group were limited to small UK clubs playing a mixture of R&B and psychedelia. Gillan quit in May 1965 to join Episode Six, and, later, Deep Purple. Gillan's eventual replacement was vocalist Brian Connolly. Tucker and Connolly remained with Wainwright's Gentlemen until early 1968.