On my iPod, I've got a playlist of about 400 songs: mostly pop, hiphop, the occasional country song, and even a few showtunes.
Today - just to stretch myself musically - I loaded an entirely new playlist of songs in genres that I don't typically listen to. Metal. Classic rock. Jazz. Classical. To get the music, I checked CDs out of the library and also raided my son's pile of CDs (not only does he have lots of metal, but he also inherited his dad's collection of 300 CDs with plenty of Beatles, Stones and other bands I typically snub).
I started listening to it when I went for a walk today. I plan to keep it on there until I make my way through all the songs I loaded.
So far, it's been kind of fun (although some of these jazz tunes aren't exactly zippy to walk to).