International Standard Recording Code. This 12-character alphanumeric code is used to uniquely identify a sound recording. One song can have multiple ISRCs if the song has been recorded, remixed or edited more than once. Publishers, collection societies and music services use ISRCs to match master recordings to underlying compositions. ISRCs are typically assigned by your label or distributor. An ISRC looks like this: US-S1Z-99-00001
