Orpheus Male Voice Choir
- Current size of 70, the reputation of the choir has grown with many competition successes over the years. Grimsby & Cleethorpe, Lincolnshire, England.
- http://website.lineone.net/~gfews/

Ogmore Valley Male Voice Choir
- This Welsh choir has a membership of around 55 members.
- http://website.lineone.net/~phildavies/choir.html

Oakland East Bay Gay Men's Chorus
- The group's history, calendar of events, contact information, photos, sound clips, audition information, member names, list of directors, and the artistic director's biography.
- http://www.oebgmc.org/