The singarounds I go to are just as the name implies - each person takes it in turn, going around the room, to sing a song or play a tune, or tell a story, recite a monologue or a poem, as the mood takes them. Sometimes an individual will invite others to accompany them or join in. The idea of "jumping in" just doesn't figure at all - anyone who tried that would get harsh words from the rest.

Sometimes there are so many people that you're lucky to get to do more than a couple of songs; other times you may be kept busy all night - that's how it goes.