According to the RIAA, a new ISRC must be assigned to a sound recording when any one of the following changes are made to the recording: 

  1. A sound recording is re-mixed or edited
  2. If a new fade changes the length of a track by more than 10 seconds
  3. If any edits are made that change the length of a sound recording by more than 10 seconds
  4. A previously released sound recording is partially used as part of compilation (in this scenario, the compilation requires its own separate ISRC from the one assigned the sound recording that was used in the compilation) 
  5. A 'full restoration' of a recording is performed by re-mastering, re-pitching, re-equalizing, de-noising or de-clicking a sound recording to meet contemporary quality standards. Please note that it is the registrant of the original recording that gets to decide whether the recording received a full re-mastering (sound restoration) or simply just a re-mastering (reproduction without sound restoration). 

For a full, more detailed description of situations that require a new ISRC to be assigned, please consult the most recent ISRC Handbook, which is available here

Don't know what an ISRC is or how to obtain one? Find out everything you need to know about ISRCs and why they are important here

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