GRAMMY-winning hitmaker Kendrick Lamar has surprised fans by releasing a brand new album, entitled 'untitled unmastered', on iTunes. 

This eight-track offering appears to be a companion piece to his record 'To Pimp A Butterfly' and all of the songs are untitled, apart for the date on which they were recorded. 

Shortly before the GRAMMYs, he told 2 Dope Boyz that he was sitting on a lot of unreleased material that wasn't included on his album: "I got a chamber of material from the album that I was in love with where sample clearances or something as simple as a deadline kept it off the album. But I think probably close to 10 songs that I'm in love with that I'll still play and still perform that didn't make the cut."

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Watch an interview with Kendrick Lamar below: