In June 1966, Van Morrison’s band Them had a two-week residency at the Whisky a Go Go. The opening act was the Doors, who also served for a time as the club’s house band. On the residency’s final night, the musicians joined together to play Gloria. The Whisky was already becoming important to Southern California groups: the Byrds, Buffalo Springfield and Love were regular performers. Frank Zappa’s Mothers of Invention obtained their record contract on the strength of a performance at the club. Source: https://en.wikipedia.org/wiki/Whisky_a_Go_Go
Source: Wikipedia, “Whisky a Go Go”