After dropping three albums in quick succession in the mid-’10s, PARTYNEXTDOOR’s personal output slowed—maybe because, behind the scenes, he was busy writing hits for others. Beyond collaborating with his mentor, Drake, PARTYNEXTDOOR brought his moody R&B aesthetic and island vibes to Rihanna’s ubiquitous banger “Work” and DJ Khaled’s RiRi-blessed “Wild Thoughts.” He’s also branched out into pop via credits for Christina Aguilera and Ella Mai.