A system and related techniques integrate the accessing, retrieving and playback of enhanced music or other digital media or content, including to permit advanced authoring, mixing and environmental inputs and effects. According to embodiments of the invention in one regard, a user may access a playback engine to retrieve and dynamically mix, manage and integrate music content with environmental sensors and effects such as detection people or numbers or people, lighting effects and other sensory experience. Thus the tempo of a mixed music track may vary with the number or persons in a room or the time of day or night, or lighting effects may brighten or dim based on dynamic contrasts in the music or other content. According to further embodiments, the playback engine may permit a user to link or navigate to other community resources such as a Web site detailing an artist, album, movie or soundtrack, or a bulletin board for consumers with an interest in artists, actors or others. Because the music authorizing format and reproduction system may compatibly operate on musical and other content containing defined media extensions and permit the content to be freely mixed and integrated with environmental inputs and effects, the richness and participation of the musical and other playback experience for the user may be enhanced.