Justin Bieber taps BloodPop, Julia Michaels, and Justin Tranter for another pop track sure to scale the charts with “Friends.” Lizzo’s self-care bop “Water Me” is as infectious as they come. Mysterious DJ ZHU brings the vibes in a slinky new EP of mixed genres. Indie pop band Grouplove wind down the summer in style with the nostalgic “Remember That Night.” And Rachel Platten returns with the sequel to “Fight Song,” another empowering anthem and rallying cry for the next movement.