We are a classic rock cover band (www.RockBoxBand.com) consisting of a drummer, me on bass, a gutiarist and a singer. I want to do Baba ORiley, but we don't have a keyboard player. I found an awesome just synth and piano backing track that I'd like to run through my iPad into the PA. We'd play OVER it. Is this cheating? A bad precedent? Or, is it totally cool for one song like this?