Stewart sang during the 1960s with Jimmy Powell And The Five Dimensions, Long John Baldry’s Hoochie Coochie Men, The Soul Agents, Shotgun Express, Steam Packet and the Jeff Beck Group.
An den 1960er an 1970er Joren huet hien a verschiddene Bands matgespillt, wéi Jimmy Powell and the Five Dimensions, Long John Baldrys Hoochie Coochie Men, The Soul Agents, Shotgun Express, The Steampacket der Jeff Beck Group, The Faces a Small Faces.