It appears Kanye West isn’t the only one singing on his new collaborative track with Paul McCartney.

Ty Dolla $ign recently shared an image of West and McCartney side-by-side via Instagram, along with a caption that revealed his involvement on the track, “Only One.”

“Get #onlyone on iTunes now !” he wrote. “My bro @kanyewest feat Paul on keys and me on backgrounds !!!#thankful.” 

It’s difficult to hear Ty’s voice behind West’s auto-tune-assisted vocals, but it sounds like the $ign Language producer-singer harmonizes during the chorus, and emphasizes a few lines throughout the song.

A press release, obtained by Pitchfork, stated West and McCartney worked together on the song last year, in a small bungalow in Los Angeles. But it did not mention Ty Dolla’s presence.

Ty Dolla has already worked with several members of Kanye’s G.O.O.D. music roster. His collaboration with Travi$ Scott, “Familiar,” was featured on his Beach House EP, and “NDK,” featuring Big Sean, appeared on his $ign Language mixtape.

HipHopDX reached out to Ty in regards to the track, but he was not available to comment.

For additional Ty Dolla $ign coverage, watch the following DX Daily:

Please enable Javascript to watch this video