So my band is going back into the studio and and we're making a pretty long demo. It'll probably up to 8 tracks or so since the guy recording us is one of our best friends and we get a HUGE discount. I'm just wondering the legality of putting a cover song on a demo. I know a few bands that have done it and I'm guessing if we don't sell the demo and we aren't making money from it, it's ok? Any advice?