The music's main purpose is to lift the dancers and help them interpret the caller's instructions. But it also needs to be listenable since not everyone is dancing all the time. So it needs to engage everyone present whether they are dancing or not. Have a look at the non-dancers and those dancers who are standing still in the set. If they are tapping feet, beating time, moving to the music, you've got it right, and it doesn't matter whether you play one tune or twenty if everyone is bopping. If they're sat there like puddings looking bored, think again.