Just show up and play their instruments
I noticed a flyer outside The Yacht Club, the IC's underground music venue. Said, "Jammin' Wednesdays" and "Instruments provided" and "Sit in on sessions" and, though belied by everything that came before, "Great music!" El Gordo, I thought you might be interested in this. If they have a bass and a guitar there, all we need is a drummer. Do we know any drummers here? Any other interested musicians? Brando, how are your karaoke chops nowadays? Surely we could get sloshed on pitchers and stagger through "God Save the Queen" or "Highway to Hell" or "I Wanna Be Sedated."