TURN BLUELike corporate drones determined to cut loose every third Friday whether they need to or not, the Black Keys take the time to schedule semi regular journeys into the unknown. Turn Blue, the 2014 successor to their down and dirty international blockbuster El Camino, is one of those trips, a churning psychedelic excursion that slowly pulses in any color you like. Those colors spread out slow and low as Turn Blue gets underway via "Weight of Love,"