My all-time favorite playlist on my iPod is the "Eardrum Tinglers Playlist." It's a smart playlist that's updated monthly. It contains all of my top finds for that month. It's hard to qualify what an "eardrum tingler" is, exactly, because the collection as a whole is pretty random. The songs can come from absolutely any genre, artist, or band. To the outsider, it might seem like there's no rhyme or reason for all of those tracks to be lumped together.
But then upon listening to the playlist, it's like, "Ohhh… whoooa… what is this fluttery tickling sensation going on inside my head? I'm almost positive I haven't taken any exogenous substances… I must be experiencing the side effects of an eardrum tingler!"