Bebe Rexha gives us an anthem to our problems with the catchy “I’m a Mess.” Plus, Mike Shinoda of Linkin Park explores his dark sides on a new album Post Traumatic; young Aussie singer Ruel debuts an EP that belies his youth; soulful singer Camille Trust explores the messier sides of a breakup on “Move On;” and producer Mura Masa brings his signature touch to a track with rapper Octavian.