After the departure of vocalist Bob James following the band's performance at Winterland on December 31, 1976, Montrose imploded as a group and Ronnie Montrose resurfaced a year later with the solo instrumental album "Open Fire", released in January 1978. During this period the guitarist also worked with jazz-fusion drummer Tony Williams. In 1979, along with Montrose holdovers Jim Alcivar and Alan Fitzgerald, drummer Skip Gillette, and Scottish vocalist Davey Pattison, Ronnie Montrose formed a new group in the progressive hard rock mould named Gamma. The band's debut, "Gamma 1" was released in 1979. Their second release, Gamma 2 (1980), saw former Montrose drummer Denny Carmassi replacing Skip Gillette and bassist Glenn Letsch replacing Alan Fitzgerald, who went on to become a founding member (as keyboardist) of Night Ranger.