Kanye West and Paul McCartney have teamed up for an emotional new song. The rapper and the rock legend unveiled "Only One" on New Year's Eve, which features McCartney on keyboard. 

The song is written from the perspective of Kanye's late mother Donda, who died in 2007 from surgery complications. A spokesperson for West called the single the first publicly available recording from the "prolific musical collaboration." 

According to Rolling Stone, a statement says:

"Kanye sat there with his family, holding his daughter North on his lap, and listened to his vocals, singing, 'Hello, my only one...' And in that moment, not only could he not recall having sung those words, but he realized that perhaps the words had never really come from him. The process of artistic creation is one that does not involve thinking, but often channeling. And he understood in that moment that his late mother, Dr. Donda West, who was also his mentor, confidante, and best friend, had spoken through him that day."

Kim Kardashian took to Twitter to call "Only One" her favorite Kanye West song and said she cries every time she hears it. 

The single is available on West's website or via iTunes.

Check out Kanye West and Paul McCartney's "Only One" via Kanye West's website HERE