Generating a pitched musical part from an electronic music file comprised of instrumental parts includes generating a control stream that indicates which of the instrumental parts has a highest value for a period of time, selecting one of the instrumental parts for the period of time based on the control stream, and outputting the selected instrumental part for the period of time to produce the musical part. Generating a non-pitched musical part from an electronic music file includes identifying patterns in the electronic music file and selectively combining the patterns to produce the musical part.