ISRC codes are an integral part of audio ID technology for industry professionals. Since each audio recording carries its own unique ISRC code, that code can be used to treat each recording as its own marketable product. That's why services like iTunes, Spotify, Amazon Music, and many more require ISRC codes in order to stream or sell individual tracks to their users. The ISRC codes embedded in each track make it possible to properly distribute royalties to you for each and every time your track is played.