A strong lead-in track from the equally consistent Colors, the debut album from Duval progressive-soul duo Bright Purpel, “La La” is the summertime jam of 2023; bloomed early in the spring. A three-minute paen to being blindsided by love, a fat-free-and-lean production (including tasty brass and a savvy loop of “La La” that is an electro-percussive force unto itself), and …