I know a guy named Billy Bob Joe, or Bill for short. He's usually very upbeat and cheerful, but something happened recently that changed him completely. He won't talk to anyone about it, or about much of anything at all.
I began searching for clues as to what had happened, but the only thing I found was this paper on his desk, apparently written after the event:
So, What happened to Bill?
Hint:
It just occurred to me that Bill has a rare condition called Synesthesia, where his brain is constantly associating music with colors, intertwining the two in his mind.
Edit: Apologies, but it appears that the image compression is changing the color values of the notes. For reference, they are supposed to be #EEDD00.