Is it the rollicking, frolicking roll of the vallenato that makes Carlos Vives sound so joyful? Or has the man himself just settled into being a downright jolly ray of sunshine midway through his illustrious career? Either way, it's working for the sweet-talking Colombian. Corazon opens with a danceable, romanceable clutch of tunes that sway to the accordion and the vallenato pitch, including hit single "Volví A Nacer" and a pitch-perfect duet with Michel Telo. But Vives can make anything -- from Afro-Colombian rhythms ("Hoy Me Desperté") to folk-inflected ballads to dance-pop hooks -- swing.