From the breakthrough of “Jar of Hearts” to her poised debut full-length album (Lovestrong.), Christina Perri’s arrival in the public spotlight has offered a series of unexpected delights. The singer/songwriter’s sophomore release continues the tradition with a self-assured collection of memorable pop hooks and mature songwriting. Perri’s starmaking gift for belting ballads is presented with aplomb (highlights include the touching “Human” and the infectious, torchy triumph “Sea of Lovers”). But Perri also shows her range with the rousing, drum-driven anthem “I Don’t Wanna Break” and a flirty, upbeat duet with English singer/songwriter Ed Sheeran.