#AmericanMusic – Barbershop: American barbershop originated from traditional quartet music brought to America by British immigrants, and was transformed into improvised acapella by black quartets in the 1870s.
Initially performed on street corners and barbershops (hence its name), it was characterized by a musical phenomenon known as the “ringing chord”.
This occurs when all four voices of the quartet are in perfect tune and balance, generating one unified resonance coupled with an overtone that resembles a fifth voice.
The ringing chord is said to sound so angelic it raises goosebumps on the back of your neck – wouldn’t you like to hear it?
For more information: http://www.newworldencyclopedia.org/entry/Barbershop_music