I experience this too.
Once on the bus I asked my friend if she was listening to an old Whitney album and she showed me her playlist and said no. I kept looking at the people sitting closest to me, and then realized I was the only one hearing that album... it was weird because I heard track after track

I've also heard children sing a Sunday school song on repeat, lol, screamed at my brother to stop playing irritating vidoe clips on his laptop so late at night!

I've also on occasion heard a gramophone I only know what it is because of movies and yes, chanting monks is another.

I have auditory, olfactory, tactile and visual hallucinations independent of episodes. They're not daily and certainly not life changing so I haven't and won't bother to tell a dr. I just don't see the point in possibly "upgrading" my dx.

So no, you aren't alone.