I am not trying to give a legal opinion here. The Fairness in Music act has exceptions which are pretty lenient in some cases concerning size of an establishment, number of speakers etc. I have no idea how we got on to this. The main thrust is file sharing of copyrighted material is a no no unless you own the copyright and retained the rights to do so. And, it has been determined that a chord progression is not included in copyright. Melody, lyrics sure. Most recently upheld in the case against Ed Sheeran (I think this is the most recent).

My wife asked if I had seen the dog bowl. I told her I didn't even know he could.