Swiss conductor Michel Corboz has devoted himself to directing the choral music of four centuries, bringing to it conviction and stylistic integrity (and a shrewd curiosity about the music of his own time). His performances of Bach are not universally liked, but that derives more from controversy over what constitutes authenticity than from lax interpretation. Corboz has addressed himself to Italian and French opera of the sixteenth and seventeenth centuries as well, achieving middle ground in stylistic matters while welcoming the presence of fuller solo voices in many key rol...