Jochen Kowalski is one of the foremost countertenors of his generation, but his slightly lower timbre -- a sort of mezzo or alto aspect within the countertenor range -- distinguishes his voice in a way that sets him apart from most of his rivals. He does not achieve his higher range through falsetto singing, but through the more natural modal voice. Besides his considerable vocal skills, Kowalski is known as one of the finest actors on the operatic stage. His repertory is broad, too: though he has traversed much Baroque fare, from J.S. Bach cantatas, Handel operas and oratorio...