Donny is right. A good percussionist "sweetens" things and makes the whole process much more enjoyable.

That being said, mot "live" performances have lots of tracks going on. Look at the drummer. Sometimes he's hitting his bass drum and double the notes are coming out. Or, he's carefully watching a red light by his throne, and has earphones on.

Same thing...just takes tons of practice. Wouldn't be worth the time for a OMB, but would probably work on a Taylor Swift tour.

R.