Well, this is one collaboration that we didn't see coming. 

Kanye West and Paul McCartney have collaborated on a track called 'Only One'. The track sees West singing from his late mother Donda's point of view, makes reference to his daughter North, and features McCartney's organ playing.

Some of the lyrics include the lines:

Hello my only one
Just like the morning sun
You keep on rising till the sky knows your name
Hello my only one
Remember who you are
Know you're not perfect but you're not your mistakes

It's the second track that the pair are said to have collaborated on, following a report that they had written a song called 'P*ss on my Grave' together.

Watch the video for 'Only One' below: