That's the title of a story I heard this morning on NPR. It's about what happened when a stranger's playlist popped up on the reporter's iTunes and he decided to meet her in person. It's well told and worth a listen.
I had a similar experience with a different outcome. I was staying in a hotel in Houston and some guy's playlist appeared in my iTunes. I was using the hotel network. Only there was one major difference; we were not musical soul mates. His playlist was loaded with Celine Deon and Kenny G.