The US Federal courts are coming under criticism for allowing music copyright cases to proceed.

In a case against Pharrell Williams by the estate of Marvin Gaye, it is alleged that a questionable expert opinion was admitted into evidence: “Just last year, the Ninth Circuit upheld a jury verdict holding that a Marvin Gaye song had been infringed by a later song called “Blurred Lines” based solely on the testimony of an expert witness that a “constellation” of elements in both pieces of music — each of which alone were unprotectable — made the works substantially similar. As the dissent remarked, the decision effectively permitted a musical style to be copyrighted for the first time.”

See: https://www.forbes.com/sites/schuylermoore/2019/11/12/the-ninth-circuit-is-tone-deaf-to-copyright/