3. The data compressor of claim 2 , wherein the command-data generator is configured to find a dictionary entry closest to the musical note to be compressed and configured to store an index for the dictionary entry in the command part.
3. The data compressor of claim 2 , wherein the command-data generator is configured to find a dictionary entry closest to the musical note to be compressed and configured to store an index for the dictionary entry in the command part. 4. The data compressor of claim 3 , wherein the command-data generator is configured to record a difference between the musical note and the dictionary entry in the data part.