Bobby Tench began his career as a founder member of The Gass, who appeared regularly on the London and U.K club circuit often jamming with others including Eric Burdon and Jimi Hendrix. The band recorded singles for CBS and Parlophone before being signed to Polydor,by now simply know as Gass. They recorded the album Juju (also released as Gass in the same year), which featured Fleetwood Mac guitarist Peter Green. Gass featured on the original cast recording for Jack Good’s stage version of Catch My Soul and eventually morphed into Gonzalez with a percussive drive and latin influences.
After leaving Gass and the evolving Gonzalez he joined the Jeff Beck Group and recorded two albums including Rough and Ready as well as touring with them. Jeff Beck included him in a later touring line-up with bassist Tim Bogert and drummer Carmine Appice formerly of Vanilla Fudge. He recorded sessions with Ginger Baker contributing to the album Stratavarious credited as Bobby Gass, which also featured the Afro-rock pioneer Fela Ransome Kuti. During this period he recorded tracks on two albums including Burglar with Freddie King. He also contributed to an album with Wailer Junior Marvin's band Hanson and was credited on Linda Lewis's acclaimed album Fathoms Deep.
He signed to A&M Records and formed Hummingbird in a line-up including former band mates bassist Clive Chaman and keyboard player Max Middleton, Atlantic Records session drummer Bernard Purdie joined the band for the last two albums We can't go on meeting like this and Diamond nights. Associations with Chapman Whitney, Mike Patto's Boxer and Luther Grosvenor's Widowmaker followed, preceeding his involvement with three studio albums by Streetwalkers including the much respected Red card album.
After his commitment to Streetwalkers finished he was involved with the production for Van Morrison’s album Wavelength which became Morrison’s best selling album at that time. He also featured as a member of Morrison's studio and touring band and during this period recorded with Eric Burdon and Axis Point before Steve Marriott included him as a member of Humble Pie, who he toured with and recorded two albums.
Later years have seen an eclectic host of collaborations, associations and recordings with others including Topper Headon, Roger Chapman, Alan Price, Ruby Turner and Humble Pie.