A system and method for creating and/or rearranging musical content on a mobile device (9) such as a cellphone or personal digital assistant, or on a computer for subsequent download and interactive playback (10) on a mobile device. The method includes the creation and use of a digital music file (4), preferably consisting of MIDI sequence data, defining a musical composition having distinct plural parts, and the creation and use of a control file (5) used in the rearrangement of the musical parts. The control file includes a plurality of control parameters (6) for the musical composition, including which parts are active for each measure of the musical compositions. A user interface (7) is included for allowing a user to alter one or more of the control parameters.
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