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Active Area Groups

• Cartoon Johnny (mixed group; Washington, D.C.)
• Chromatics (mixed quintet; Washington, D.C.)
• DC Accidentals (mixed group; Washington, D.C.)
• DC Vocals (mixed group; Washington, D.C.)
• Euphonism (mixed group; Washington, D.C.)
• Take Note! (mixed quintet; Washington, D.C.)
• Tone Rangers (men's group; Washington, D.C.)
• Tonic and Gin (mixed septet; Washington, D.C.)

• The Bobs (mixed quartet; Los Angeles)
• Cadence (male quartet; Toronto, Canada)
• Idea of North (mixed quartet; Australia)
• King's Singers (male sextet; Cambridge, England)
• Kinsey Sicks (male quartet; San Francisco)
• The Manhattan Transfer (mixed quartet; New York City)
• New York Voices (mixed quartet; NYC)
• Pieces of Eight (mixed octet; NYC)
• The Real Group (mixed quintet; Sweden)
• Swingle Singers (mixed octet; London, England)
• Take 6 (male sextet; US)
• Toxic Audio (mixed quintet; NYC)

• Davinci's Notebook (men's quartet; Washington, D.C.)
• Moxy Früvous (men's quartet; Toronto, Canada)

• Contemporary A Cappella Society
• Harmony Sweepstakes
• A-Cappella.com (formerly Mainely A Cappella)
• Primarily A Cappella
• Recorded A Cappella Review Board (RARB)

• Sheet Music Plus
• Sheet Music Online
• J. W. Pepper

• Shure - Microphones
• Mackie - Mixers
• Yamaha - Speakers, Digital Recorders
• Washington Music Center/Chuck Levin's