Okay, so Paul Hindemith was a German composer of the mid 20th century, and is most famous for having written a concerto or sonata for every instrument of the orchestra. He claimed, furthermore, that he was skilled enough to play each of his own works ont he given instruments... yeah, that hasn't exactly been proven.

Anyway, his Clarinet Sonata is the epitome of modern, atonal, and aleotoric music, because it jumps around between keys, has severe dissonances (a lot of sour notes in here aren't my fault, they're written that way...), and polyrhythms/meters that don't mesh together well.

But, excuses aside, this was my best shot at it, and it turned out alright. By this time in my recital I've already played about 25 minutes of hard music, and I'm getting tired. Listen by the end of the 4th movement, as it gets harder and harder for me to play. Total time from first to fourth movement of this piece is 20 minutes :C