O'Mara, Stephen: American tenor. Calendar, photographs, and upcoming events.O'Neill, Simon: New Zealand tenor. Resume, biography, photographs, MP3 files, and calendar.Oberlin, Russell: American countertenor. Profile, discography.Oberoi, Krishan: Young New England tenor; 1996 honors graduate of New England Conservatory of Music; active with regional opera companies; singer and composer.Obraztsova, Elena: Russian mezzo soprano. Biography, discography, schedule, sound clips, bibliography.Ogden, Robert: English counter-tenor. Biography, photos, audio clips and reviews.Olson, Lisa-Marie: News, pictures, upcoming and past performance information for this soprano.Olson, William: Young American opera baritone's biography, resume, photographs, sound clips, future engagements, and contact information.