Book Number (ISBN), a similar unique identifier for books International Standard Musical Work Code (ISWC), a unique identifier for musical works such as songs Universal Product Code (UPC), Universal Product Code Label Code a unique 4-digit or 5-digit music label identification code that is assigned by Gesellschaft zur Verwertung von Leistungsschutzrechten [de] (GVL). References External links ISO 3901:2001 Technical Standards: The International Standard Recording Code at Recording Industry Association of America's Website. ISRC registration authority Music videos ISO standards Unique identifiers Identifiers