The Sicilian nobleman Sigismondo d'India was roughly contemporary with Monteverdi (both began their careers around 1600); the musical ferment of that period led, in d'India's case, to a very heady brew. His madrigals--duets, solos and five-voice works--are like inebriated Monteverdi: d'India set the Italian poetic texts (usually dealing with a lover's pain) with even less regard for academic counterpoint and even more surprising twists of harmony than did his more-famous colleague, yet the music never veers into the disorienting, seemingly willful weirdness of Gesualdo. William Christie and Les Arts Florissants have made occasional forays into the music of 17th-century Italy before, but their real turf is the French Baroque--and on this disc, it shows. The fast passagework is blurred; the vibrato (from the sopranos in particular), while not wide by modern operatic standards, is sufficient to smudge d'India's searing dissonances. Some of the so...