Kanye West and Paul McCartney are allegedly collaborating on an album. The rapper and the Beatle are said to be working in secret on “a number of tracks”, with the possibility of expanding the project into a full LP.

On Monday, the New York Post corroborated the Mirror’s recent claim that West and McCartney have met several times to discuss teaming up. But the Post went even further, asserting that several songs are already in progress. One of these, tentatively titled Piss On My Grave, apparently “surprised” West’s wife, Kim Kardashian.

Contacted by the Guardian, a spokesperson for McCartney would neither confirm nor deny the collaboration. “No comment,” they stated.

Speaking to Zane Lowe last October, McCartney revealed that he had considered recruiting a rapper like “Jay Z [or] Kanye” for Appreciate, one of the songs on New. “[I] resisted the temptation,” he said. The 72-year-old also admitted to have experimented with auto-tune after he “went to see Kanye”. “[I thought,] ‘You know what? That’d be fun.’” Earlier that summer, McCartney tweeted that he had bought West’s album Yeezus alongside other recent purchases like the Civil Wars’ second record and the National’s Trouble Will Find Me.

West, meanwhile, has worked with several rock and pop artists in the past, including Elton John and the Police. But he also snubbed Jack White during the making of Yeezus. Speaking in July, West said he hoped to release his new album before the end of 2014. Although he had already come close to finishing it, he decided to re-boot the whole thing in order to make it less “beautiful”. “Before ... I had these beautiful songs, [but] they were just more songs,” he explained. “They weren’t saying, ‘OK, tuck your whole summer in.’”