Master Recordings are also known as “sound recordings” is the actual recorded piece of music. A master license differs from a sync license in that a sync license gives the license holder the right to re-record a song for use in a media project, while a master license gives the license holder the right to use a pre-existing recording of that song in a media project. A sync license, from the publisher or rights owner, is usually required in conjunction with a master license to use a pre-existing version of a song with a visual project.