One variation of a method for distributing a composition of audio and visual media includes: at a first computing device, generating a first meta file for a first composition, including pointers to an audio track and pointers to, positions and durations of video masks for, and an order for a set of videos; storing the first meta file and a portion of a private video, in the set of videos, in a remote database; serving the audio track and the set of videos to a second computing device for playback at the second computing device according to the first meta file; in response to modification of the first composition at the second computing device, generating a second meta file for a second composition defining a modified arrangement of the first composition; and storing the second meta file for local playback of the second composition at a third computing device.