King Crimson’s Robert Fripp was on hand with David Bowie and Brian Eno for the recording of 1977’s “Heroes”; that’s Fripp’s iconic guitar work on the album’s title track. Fripp returned to collaborate with Bowie on 1980’s Scary Monsters. Now, Fripp says that he’s in a dispute with Bowie’s estate over how he’s credited on those two albums, Rolling Stone reports. Fripp asserted on social media tonight that he should be credited on both albums as a “featured player.”

“This accreditation as a Featured Player is supported by Brian Eno, Tony Visconti, David Bowie himself (although the terminology was not then in use), and the Court Of Public Opinion over four decades,” he wrote. Fripp claims that Bowie’s estate hasn’t acknowledged his status as a featured player due to the rules of UK music licensing company PPL. He says PPL’s rules “perpetuate an historic injustice.” Fripp continued:

Fifty-two years of direct, hands-on experience suggests to me that the majority of players who operate the system, operate the system to serve their own interests. There are a small number of players whose aim is ethical action in business; not directing the industry to promote their own personal interests; these assertions supported by decades of documentation.

When reached by Pitchfork, representatives for PPL sent the following statement:

PPL licenses recorded music played in public or broadcast on radio and TV, and distributes the revenues it receives from the licence fees. In 2018, this resulted in PPL paying more than 100,000 performers and recording rightsholders. In making these distributions, we operate according to a set of Distribution Rules that have been in place for some time and were approved by individuals representing a broad cross-section of the recorded music industry including both Featured and Non-featured performers. Whilst we are unable to comment on individual cases, performers are classified using a performer classification system set out in PPL’s published Distribution Rules. All classification is made based on applying the information we receive from the relevant parties to these rules. It is important to point out that the classifications within these rules do not seek to make any value judgement on the quality, importance or extent of a performer’s contribution on a recording. PPL is always mindful of the different ways in which all of our members can be affected by our policies and we remain committed to operating a fair and straightforward system of distributing revenue to all performers.

Pitchfork has reached out to representatives for DavidBowie and Briano Eno for comment.