Kendrick Lamar's good kid, m.A.A.d. city track 'PARTYNAUSEOUS' featuring Lady Gaga leaks

The track was scrapped due to 'creative differences' between the two camps

US rappers like Kendrick Lamar (above) sip Saracco Moscato d'Asti at parties and namecheck it in their lyrics (AP)

Taylor Swift wasn’t the first popstar to work with Kendrick Lamar. Back in 2012, while writing good kid, m.A.A.d. city, not only were Drake, Dr. Dre and Pharrell in the studio but also the crazy queen of pop, Lady Gaga.

What followed was “PARTYNAUSEOUS”, a low-fi rap track with Gaga on hook. However, due to "creative differences" between the two camps, Kendrick's track never saw the light of day.

Gaga went on to create a high-octane Euro-pop track out of the remnants of her part, playing it as an interlude on her ARTPOP tour. When Kendrick's To Pimp A Butterfly came out earlier this year many expected the track to feature on it but this was unfounded.

Now, thanks to internet pirates, Kendrick’s version has finally leaked online, fully intact. Listen below before it goes.

It's still unclear whether the track is the final version or a demo, but judging by Gaga's vocals it doesn't sound like a final take.

Now that you've heard how the song was originally suppose to sound, here's the Lady Gaga 'remix'. It's... different.

Kendrick recently featured in Taylor Swifts music video for Bad Blood, a reworking of the 1989 album track with the "King Kunta" rapper doing two guest verses.

Read more: Lamar on his way to taking Kanye West's rap crown
Everyone's freaking over To Pimp a Butterfly's outro with 2Pac
Watch the music for King Kunta here