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Jack’s Mannequin, ‘The Glass Passenger’ (Sire/Warner Bros.)

Launched by keyboardist Andrew McMahon when his alt-rock quintet SomethingCorporate went on hiatus in 2004, Jack’s Mannequin isn’t a throwaway side project. The Glass Passenger, the group’s second album, chronicles McMahon’s successful battle against leukemia, matching hyperemotional melodies with his tender voice on dramatic tracks such as “Swim,” where he exclaims, “I’m not giving in!” Some songs feel like generic emo exercises, but the delirious “Caves,” a memorable eight-minute meditation on illness and treatment, suggests McMahon has staying power.