This is the time of year when the competition for the Jam Of The Summer title really, seriously heats up. Over the weekend, Drake and Nicki Minaj both released new videos, and so did ascendant rappers like Future andFrench Montana. The most entertaining non-”HYFR” clip, though, is the one for “Riot,” from slurry and tall Atlanta MC 2 Chainz, who has improbably become one of my favorite rappers after close to a decade of constant mediocrity. The “Riot” video, from director Decatur Dan, is fun low-budget apocalypse stuff, with 2 Chainz speechifying like Cyrus in The Warriors and a mob of bandanna-faced extras giving the camera intimidating stares. It’s fun! Watch it!