Something that continually makes your brain hurt, as not even the teacher knows what to do sometimes, and can lead to brain juice leaking out of ears.

Side Effects : Rocking back and forth in the corner while you hold your knees, because the proper way to resolve a half diminished VII chord is wrong.

A class that saps all the fun out of music. You will start the year off excited and enthusiastic, but by mid semester, you'll be thinking, "Why the fuck did I take this class, again?"

By the way, John Lennon and Paul McCartney couldn't read music. Shove that up your ass, AP Music Theory.