Finds Shannon's relative entropy of .wav files
For now, only handles stereo, 16-bit sample width .wav files.
For usage information type:
./music.py help
./music.py plot time '~/01 Roar.wav'
./music.py plot freq '~/01 Roar.wav'
./music.py get_shannon_rel_entropy '~/02 - De Praestigiis Daemonum.wav'