Just resign yourself to the fact you'll look like an autistic kid when you're playing it. Tap your foot, bop your head, rock your body to keep the beat. It really helps.
The thing that took me longer to figure out than it should have is that you go for 4 beats, and your minions go for 4 beats. Then you, then them. It's a continuous back and forth of 4 beats each.
The easiest way for me to be on the beat was to watch for the flashing frame around the screen. Push the button as it lights up.