As a lifelong music lover, I came across this cool site and had to bookmark it. Incredibox.fr allows you to make your own song by choosing an instrument, percussion, voice, effects, chorus and a "bonus". Each one that you choose shows up as a different "character" and makes your song a little different. When you're done or if you want to change out an item, just double-click on it.
Any time I need to zone out or just waste a little time on the web (not social networking) this is one of my choice destinations. Check it out, I'm sure you'll spend some time here.