Post Malone is suing Tyler Armes, the musician and producer who sent a cease-and-desist letter to the pop star over claims that he deserves songwriting credit and revenue from the 2019 hit single `Circles.`

The artist, whose real name is Austin Post, filed a lawsuit against Armes in the U.S. District Court of Southern New York Tuesday. The same day, Tyler Armes also sued Post, Adam K. Feeney (known professionally as Frank Dukes) and Universal Music Group in California District Court.

Post claims that Armes was present during the first songwriting session for `Circles` but that he did not write any music or lyrics and is therefore not entitled to revenue or songwriting credit. Armes claims that he co-wrote the bassline and the song's melodic guitar riff and should be credited as a co-writer.

Armes' suit also claims that Post initially offered him a five percent share of the song's publishing royalties, which Armes attempted to negotiate to a larger percentage. In response, Armes says, Post's manager threatened that if he didn't accept the five percent, he would get nothing.

View this post on Instagram

#PostMalone's hit "Circles" is at the center of a new lawsuit. Tyler Armes claims he co-wrote the song, but Malone hasn't given him credit or a share of the royalties. The latest legal news at the link in bio.

A post shared by Hollywood Reporter (@hollywoodreporter) on Apr 7, 2020 at 7:45pm PDT

Post's suit is asking the court to declare that Armes `is not a joint author of the Circles Composition, and that Armes is not entitled to any of the revenues earned by that composition.`

Armes is asking to receive both future and retroactive royalties for the song and to receive co-writer and co-producer credit.