We use set lists. We have 7 guys in our band and it get's tricky calling out ad-hoc songs between songs. We provided NON-STOP music so the transition from one song to the next is very important when people are on the dance floor.

We change the set's and do requests during and at the start of the next set. We've been doing this a long time and our set's are setup for the peak dancing sets.

Al