A collaboration between Duval new-soul and hip-hop artists Bright Purpel and multi-instrumentalist and producer Culture School offers up a radiant glow. The second track from Culture School’s new release Nail Salon, the three-and-a-half minutes of “Purpel” moves along courtesy of an unhurried chromatic keyboard riff, with Culture School (Quinn Spencer) and Bright Purpel (K.UTIE and Jeremy Ryan) trading off lyrics …