US Patent 7474930 System for retrieving and playing audio files

A method of obtaining an audio file, the method including providing a plurality of separately identifiable audio files; associating each of the plurality with one or more identities; providing at least one substrate visually identifying at least one audio file, the file also being identified by an encoded identity on the substrate; selecting at least one of the at least one audio files of the at least one substrate with a selection device, the selection device sensing the coded data corresponding to the file; determining the identity associated with the coded data of the selected audio file; and downloading the audio data identified to the selection device.