On her second album, 21, Adele sings of loss and vulnerability with an assertive voice that burns with fury as she gains momentum. With production by Rick Rubin and Paul Epworth, the “Chasing Pavements” star picks up where she left off with 19— a bit older and wiser, influenced by the classics and new movements. “Rolling In the Deep” and “Someone Like You” scale new heights of glorious misery, but it’s Adele’s conviction—not pity—that forms the lasting impression.