US Patent 8639706 Shared metadata for media files

Methods, systems, and apparatus, including computer program products, for organizing music tracks based on shared metadata. In one aspect, a method includes identifying a set of common music tracks associated with a first user and a second user, wherein the set of common music tracks includes at least one music track present in both a first set of music tracks associated with the first user and a second set of music tracks associated with the second user. Metadata associated with at least one music track in the set of common music tracks is retrieved, the metadata being specific to the second user. A set of user music tracks associated with the first user is organized based on the retrieved metadata.