While fans have speculated about the song since Kendrick Lamar premiered it in December, Terrace Martin says a track the To Pimp A Butterfly rapper performed on the final episode of The Colbert Report will never be released.

Speaking with Complex yesterday (March 26), Martin, who produced eight songs on Kendrick’s latest release, admitted that the only recording that exists of the track simply known as “Untitled” came about with Lamar’s live performance.

“It don’t even exist nowhere in the world, except on The Colbert Report,” Martin said.

Martin also shrugged off rumors that Dr. Dre contributed to the album under the alias LoveDragon and hinted that the still unnamed producer could be sussed out by taking a closer look at the writing credits for songs like “How Much A Dollar Costs” and “You Ain’t Gotta Lie.”

Kendrick Lamar earned his first #1 album with the recent release of To Pimp A Butterfly. The new album sold a total of 324,403 copies in its first week of availability.

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