The International Standard Musical Work Code, or ISWC, is a unique identifier for musical works. Like the ISRC is for recordings and the ISNI is for people, the ISWC helps identify and disambiguate musical works. Along with being a unique identifier, the ISWC is also permanent and an internationally recognized ISO reference number for the identification of musical works.
YouTube announced this week they are implementing the ISNI standard for name disambiguation across their whole platform. The International Standard Name Identifier is an ISO-certified global standard number for uniquely identifying anyone who creates anything. Public names of a researcher, investor, writer, artist, actor, performer, publisher, etc... are unambiguously attributed by number globally in perpetuity regardless of field, medium, or type of art/creation.