The mystery surrounding the production on Pusha T’s My Name Is My Name record “King Push,” has been present ever since the G.O.O.D. Music emcee informed Vibe magazine that actor and one-time rapper Joaquin Phoenix was the man behind the song’s beat.

Additional rumors led many to believe the “King Push” beat was in fact provided by Metallica drummer Lars Ulrich’s son, but it wasn’t until recently that the name of the beatsmith behind the production on “King Push” was revealed.

The beat on the My Name Is My Name opening track was created by an up-and-coming producer by the name of Sebastian Sartor. Speaking exclusively with XXL magazine, Sartor, whose mother starred alongside Phoenix in Gladiator, revealed what may have led to the initial confusion surrounding the identity of the beat’s creator.

“I’ve known Joaquin for a while, and we just kind of reconnected,” said the producer and former Universal Music Group intern. “I played him some stuff—I just wanted to get feedback, I never expected it to go the way it went. I played him the track, and he said to me, ‘I’m gonna play it for my friend.’ It wasn’t Kanye. But it was crazy.”

Ironically, it was after being denied entry into Pusha T’s My Name Is My Name listening party that Sartor came across an Instagram video from the Clipse rapper’s party. In the video, a short snippet of “King Push” is played and it’s at that moment he realized at least a portion of his beat, titled “Eerie Dark 2” on his hard drive, was included on Pusha’s solo debut. Sartor was later able to hear the song in its entirety while watching the “King Push” music video.

“The first time I heard it was when I didn’t get to go to the listening party,” said Sartor. “I wanted in so bad that I think I sat on Instagram and just typed in hashtags that it could have been. And somebody had taken a video of a 10-second snippet of the end of the track. I was like, ‘It’s on the fucking record’…The first time I heard the full thing was the music video, and I think I listened to it like 100 times on repeat. It was so dope, I couldn’t even…I think I was just joyous. It was even better than getting the e-mail.”

Following reports that Phoenix provided Pusha T with the beat featured on “King Push,” the actor released a statement denying any involvement with the song and also gave credit to Sartor who he referred to as “a friend’s son.”

“While it was widely reported that Pusha T used my beat and that I produced his song, I can’t take any credit,” Phoenix said in a statement to XXL. ”A friend’s son played me his music, and all I did was make an introduction to Kanye [West]’s camp.”

Released on October 8, Pusha T’s My Name Is My Name also includes production from Kanye West, Pharrell Williams, The-Dream, and more.

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