Choruses |
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| A Capella Showcase | Alexandria Harmonizers | The Alliance | Atlanta Vocal Project | Perth Harmony |
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| Pride of Baltimore | Red Rose Chorus | Red Rose City Chorus | San Diego Chorus | The Scottsdale Chorus |
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| Skyline Chorus | Song of Atlanta | Vocal Evolution | The Vocal Majority | Voices in Harmony |
Quartets |
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| 4getmenots | Alliance Quartet Australia | A Mighty Wind | The Allies | Bling |
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| Four Man Fishin' Tackle Choir | Masterpiece Quartet | Musical Island Boys | Reckless | Steel |
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| Unlimited Quartet | Vocal Unlimited | Zing | ||
Affiliates |
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| AAMBS | Barbershop Harmony Society | BING! | BABS | Harmony Inc. |
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| Holland Harmony | LABBS | SNOBS | Sweet Adelines International | |
