Amazon.com essential recordingMonteverdi's Fifth Book of Madrigals begins like the Fourth Book--the first half of the publication contains five-voice a cappella madrigals (with optional continuo) that use surprising dissonances to express the images and sentiments of their texts with extraordinary intensity. The second half, however, breaks new ground: the continuo (i.e., accompanying chord instrument like harpsichord or lute) part becomes independent (and indispensable), thus enabling Monteverdi to set extended passages for one or two voices. One fine example is "T'amo, mia vita" ("I love you, my life")--a rapturous meditation by a young lover who has heard his beloved utter those words. Monteverdi sets the four words for solo soprano, repeating them between lines of the young man's reverie as if replayed over and over in his mind. Concerto Italiano's performance is, quite simply, extraordinary. --Matthew Westphal