Once we get started, singing goes around the group in a circle. When your turn comes,you may choose to sing something, request a song from the group in general or from a specific person, or pass (and those–aside from those of common courtesy–are all the rules we have). We all join in on choruses and anything else we recognize. There’s no official body of songs, though a lot of people bring Rise Up Singing (AKA “The Blue Book”) or other songbooks. Some people accompany themselves on various instruments, some don’t.