Carreón-Robledo says he understands the pitfalls of women singing men's roles, especially of allowing the voice to sound too feminine. ''These two singers, they are both mezzo-sopranos, are really fantastic in that sense. It's hard sometimes to accept that a woman is playing a man, but in the realm of sound, which is where this opera lives first and foremost, they have each done an excellent job at impersonating a young man.''
Thursdays-Saturdays, 7:30 p.m.; Sun., Nov. 18, 2 p.m. Starts: Nov. 8. Continues through Nov. 18, 2012