By Appointment Award Winning A Capella Quartet
- A Capella medalist quartet for the British Association of Barbershop Singers (B.A.B.S.)
- http://www.byappointmentquartet.co.uk

B Sharps Barbershop Quartet
- A Quartet based in Perth Scotland, established in 1998, who have a varied repertoire and are available for weddings, funerals, retirals and other special events.
- http://www.bsharp-barbershop.co.uk

Brooks Brothers
- Comedy quartet from Charleston, Illinois known for their "Singing Sumos" routine.
- http://www.harmonize.ws/brooksbrothers/

Bluegrass Student Union
- 1978 International Quartet Champions from Louisville, Kentucky.
- http://www.harmonize.com/bsu/Default.htm

Bravo!
- The 2001 Land of Lakes District Quartet Champions. Links to its members chorus and associated organizations.
- http://arneberg.com/bbshop/bravo

Barcode Quartet
- Barcode (formerly Voice Male)1998 Dutch barbershop quartet champions.
- http://members.home.nl/l.guikers/

Break Point
- 1998 Land O' Lakes district quartet champions from Fargo, North Dakota.
- http://www.arneberg.com/bbshop/breakpoint/

Back Fourty
- A registered SPEBSQSA Quartet based in the Des Moines, Iowa area.
- http://www.harmonize.com/BackFourty/

Barreltones
- Quartet with two members from the Bowie Knights of Harmony and two from Heart of Maryland chorus.
- http://www.harmonize.com/heartofmd/brltones/

Brothers 4 Tune
- An A Cappella quartet from the Netherlands which sings 4 part doo wop, close harmony and barbershop.
- http://www.brothers4tune.com/

BS
- Kenmore State High School quartet from Brisbane Australia. High Distinction award winners at the 1998 Australian Academy Festival of Music.
- http://www.harmonize.com/BS/

The Boys Next Door
- Dallas, Texas quartet available for shows.
- http://www.harmonize.com/swdroundup/BOYSNEXTDOOR.htm

By Popular Demand
- 1999 Illinois District Champion Quartet and International Competitors.
- http://www.harmonize.ws/bpd/