Are you restless like me?

I think iTunes should have a different way to sort your music. Instead of a single genre for each song you should be able to list multiple genres or tags (c/o Flickr) for each one. That way you could separate your music by mood or location or anything else that strikes your fancy. Instead of creating a million playlists with songs in every possible combination. If you wanted to listen to sad songs you could just choose all of your sad songs, versus forcing all sad songs into one genre or sorting through your art rock, alternative, indie, acoustic, etc. Instead of my huge list of "emo" songs, I could separate them more specifically and have multiple tags for each one.

I was going to give an in-depth example, but I'm suddenly very tired. And I can't think of any.