Here are some of the best resources for music publishing:

Songtrust

Songtrust

Songtrust is the world’s largest technology solution for global music royalty collection and
publishing administration, enabling 200,000+ songwriters and more than 25,000 publishers
to collect their publishing royalties worldwide for over 2,000,000 copyrights.

Know What You’re Owed, Then Access It
Music publishing refers to the money you make when people or businesses use your original, copyrighted music. Whether your song is streamed or sold in the U.S., played on TV or in a bar in Europe, or used in a movie in Asia, you may be entitled to royalties.

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Learn more: Songtrust