From the piece that won't be finished for another 600 years to the one written by the composer's cat, there's some very strange pieces in the world of music. Check out this list (including recordings/videos) for some music we won't be playing in class!
http://mentalfloss.com/article/54441/10-really-weird-pieces-classical-music
http://mentalfloss.com/article/54441/10-really-weird-pieces-classical-music