I don't care if you are a band, and want to promote your new song. If I am shopping for music, then odds are very good that I like music, and that I am already listening to something. Your shit doesn't sound good mixed up with whatever I'm listening to.
Don't set up a player widget to start automatically. Bonus asshat points if you hide the stop button. That just makes me leave your site much sooner.
Do put a player widget on the page and make it easy to see. I promise I'll click play when I'm ready.