Kanye West has announced a new collaboration with Rihanna.

The rapper made a surprise appearance at the iHeartMedia Music Summit in California on Wednesday (January 21).

Billboard reports that he gave a 45-minute talk which looked at the theme of "innovation".

He ran through an a cappella version of his recent Paul McCartney track 'Only One' before playing a new song via his laptop.

The track featured Rihanna and it is currently untitled, with the song expected to feature on West's next album.

Billboard added that it "featured acoustic guitar and a big, soaring chorus and melody with a massive hook".

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Watch Kanye West being interviewed below: