The sound of Emma Kirkby’s voice is unmistakeable: silvery, precise, and soaring. Throughout her long career at the heart of the British early music world, that sound has been a vital part of the revolution in performance styles in the works of the Renaissance and Baroque eras. In an absorbing account of these moving cantatas, mainly associated with mezzo or baritone voices, Kirkby’s radiant tone casts new light on this music, blending seamlessly with the Freiburger Barockorchester. Ich habe genug is performed here with a rare poignancy.