Chops: (n) slang: The technical virtuosity in playing a musical instrument.
So you think you got musical chops, eh? Do you play Chopin or do you just play "Chopsticks"? To score this cache, you will need to play the score. Since this feat requires musical knowledge, a keen ear, and the ability to play an instrument (possibly), I've rated this a four. I wrote this for voice and piano so my apologies for those who play the drums or triangle. The score isn't terribly hard from a technical perspective...but the cache itself may be hard to score. We shall see if your chops, geo-wise and music-wise, are up to it!
NOTE: I've used bits and pieces from a fairly broad time range of music. You may need your children and/or grandparents on this one.
The container is your usual ammo can with some fair swag, and a nice topo map for the first-finder with enough chops to get it. Also I've added some sheet music and CDs with the music of interest, and some Travel Bugs.
Listen closely. Look carefully. Happy hunting!