I agree with Happyland.
I mean on my iPod you've got things like:
Pop, Rave, Dance, Trance, Electronic then it'll go onto Rock, Heavy Metal, Emo, Drum & Bass followed by Rap & Hip Hop and then you've got songs from the 40s, 70s, 80s, 90s and Noughties.
People that subject themselves to just one kind of music like the way 'Rockers' would listen to Rock and completely put down any kind of Trance Music what so ever, even if it is Amazing, It's kind of sad.
Having a massively wide variety of music is epic.