Given his musical theater background, it’s no surprise that Pedro Capó fills his latest album with high drama, pushing those stage-trained pipes to ecstatic release on power ballads like opener “Azucar Amargo.” But the Puerto Rican heartthrob is also a shape-shifter, gliding between soulful retro pop and up-to-the-minute sleekness on En Letra de Otro. Capó swaggers while the beats rumble like a ’60s dance-craze hit (“Amor Prohibido”), and he smolders atop modern tropical grooves that inspire real shivers (“Otro Día Más Sin Verte”).