By JAY NORDLINGER [NY Sun, 17 April 2008]

Nathan Gunn is a baritone, famous for taking his shirt off in opera productions. (He is famous for being a very fine singer and singing actor, too.) Julie Gunn — or “Dr. Julie Gunn,” as she is known in her bio — is his wife and a pianist. They often give recitals together, and they gave one at Zankel Hall on Tuesday night. It was an exceedingly unusual recital.