OVERTONES! What are overtones? What do they sound like?

Check out these examples of AMAZING overtones (and undertones) in barbershop performances.

See full performances of the examples here!
The Vagrants: The Vagrants- Chordbusters March
Scottsdale Chorus: Scottsdale, Finals, Las Vegas 2015
After Hours: After Hours - Nowhere to Go But Up [f...
Main Street: Main Street Apple Blossom Time

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