On the making-of documentary included with the “Experience Edition” of Gorillaz’ latest album, Plastic Beach, band creator (and former Blur front man) Damon Albarn bemoans the state of the cohesive album in the age of iPods and Random Play.  It’s a legitimate problem, and one that the first two Gorillaz albums tended to accommodate.  Collections of relentlessly catchy singles alongside more esoteric pieces, neither Gorillaz’ self-titled debut nor their follow-up Demon Days ever really cohered as an album.  You’d start one, get hung up on listening to “Feel Good Inc.” …