My dogs favorite song...

So I figured out my dogs favorite song. Tom Petty & The Heartbreakers- Mary Jane's Last Dance

How did I figure this out?
When I use my computer right before I go to bed she is laying down to my right, well I had the song playing and she turns around and puts her head on me, then when I muted it to make a phone call she put her head on my laptop, when I played it again she moved her head again, so I did this a few times and every time she kept putting her head on my laptop. So now I play it for her before she goes to bed!