The hip-hop star has surprise-released a new compilation of rare tracks, B-sides and previously unheard recordings, featuring the likes of Killer Mike and Kanye West.

Train of Thought: Lost Lyrics, Rare Releases & Beautiful B-Sides Vol. 1 also includes collaborations with Common, Consequence and Yasiin Bey (aka Mos Def).

The new album's highlight track is the West-produced Wack N**gaz, which features guest verses from Kanye, Common and Consequence.