The present invention provides a music playback system which uses an interface to easily play back a characteristic musical structure section with a music audio data playback apparatus. The interface 13 includes a function of selecting an arbitrary characteristic music structure section from a plurality of characteristic music structure sections, and a function of visualizing a characteristic music structure section. The characteristic music structure section specifying data for specifying the selected arbitrary characteristic music structure section is given to a music audio data playback apparatus 3. The music audio data playback apparatus 3 changes a playback position of the music audio data to the characteristic music structure section specified by the characteristic music structure section specifying data given by a specifying data providing means 12.