Is Google playing my Play Music library at my grocery store?

I'm embarrassed to ask for fear of being told i'm paranoid schizophrenic. That said, I've been shopping exclusively at a Giant near my home. I use a rewards card. Ever since I uploaded my library to Play Music, I've started hearing fairly obscure tracks from my library being played back to back. I also use Waze on my Android phone when I drive to that store. Is there any talk of Google doing this? via /r/www.stmag.info