That's how CT Dave introduced each show. The "Human Bein" got things rollin' with his drums. Jim and Billf got things rockin' with guitars, and Billy started singing; "Knock Knock Rock".... "Well I was sittin' around, diggin' some sounds, when I heard someone at the door. I went to the door just to make sure. And sure enough, I heard it once more; Knock knock. Who's there? Rock. Rock who?.... Rock & roll. Rock & roll. Rock & roll!