The present invention is intended to provide an audio playback apparatus which is capable of randomly reproducing music on an album basis or a folder basis. In a sound source in which a plurality of music files are hierarchically recorded, a unit of music file groups in each of which music files are...http://www.google.de/patents/US7689304?utm_source=gb-gplus-sharePatent US7689304 - Audio playback apparatus, audio playback method, and program
