Bach Decomposing Joke

This Joke is meant for Scouts BSA.

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Two grave robbers decided to rob a grave, that's what they do. They find a prety nice grave and start digging.
After they dug up the topsoil they found a hole and in the hole there was a man with wild white hair sitting in front of a piano. The man would play a couple notes then erase something on a piece of music.
The two men, amazed beyond belief, yelled down to the man, 'Who are you, and what are you doing?' The man looked up and said...

'IM BACH, AND IM DECOMPOSING'