You could argue that Gorillaz very existence is testament to the surfeit of sonic ideas and hummable choruses clogging Damon Albarn’s mind. That spirit of overbrimming creativity (just see the chuggingly anthemic “We Are Happy Landfill”) carries over into this bumper collection of B-sides, rarities and remixes culled from the Demon Days sessions. “Bill Murray” enlists The Bees for a woozy ska workout and Jamie T’s take on “Kids With Guns” may be the pick of the reimaginings.