Round here we tend to play through each tune 3 or 4 times depending on who's leading the set - everybody else pays attention and when he/she says 'hup!' you know the tune's about to change. Sometimes it'll go on another time round because evewryone's enjoying it. We tend not to sit there beforehand and say, right, we'll play tunes x, y and z, and we'll play them all 3 times. We make sets up as we go along. Sometimes two players will take turns picking the tune.