I'm not sure I agree with the first part of your comment. Spotify already does this, and in my experience plenty of people leave spotify on as background music and/or at a party.

My old roommates did this pretty frequently, and while it was annoying at first to hear ads between songs, as long as they're short enough, you eventually just tune them out.

If anything I'd say that the youtube style ads that play before your content are more aggravating, since you are delayed from actually seeing the content you are trying to watch, much like a loading page is generally a worse experience than a loading content area.