The Allies
- A barbershop quartet who are all active members of the international medallist chorus, The Alliance.
- http://www.thealliesquartet.com

After Five
- A Quartet from Eugene Oregon who are still together after 5 Baritones.
- http://www.cascadechorus.org/AfterFive.asp

Acoustix
- 1990 International Quartet Champions from Dallas Texas.
- http://www.acoustix.com/start.htm

As You Like It
- Quartet from Marietta Georgia that has been singing together since the winter of 1989.
- http://www.bigchickenchorus.org/quartets/asyoulikeit/asyou.htm