LPT: If somebody is showing you music they really like, don't talk over it to them unless it's about the song or urgent. That music could mean a lot to them, and talking shows you're making your thoughts more important than theirs.

If you're with a group of people this is for sure fine to do, but one on one I believe this to be relevant.

Posting because I'm thankful that my friends do not do this, not the other way around.