A music editing apparatus is provided that uses so-called time line meta data that describe a beat and melody structure of a song to automatically accomplishes an automatic DJ remix play with a low load. The apparatus also includes a synchronous reproduction controlling section which sends a master beat to the remix processing section and reproduces a plurality of songs corresponding to a remix process which the remix processing section designates corresponding to a remix pattern and the meta data and a mixing section which mixes the songs reproduced by the synchronous reproduction controlling section. The synchronous reproduction controlling section also includes a phase comparator which compares a phase of a beat synchronous signal generated from the meta data supplied from the remix processing section with that of the master beat signal; an integrating circuit which integrates a phase compared output of the phase comparator; and a correcting section which corrects a tempo based on an integrated output of the integrating circuit.