As a horn player, and a Barbershopper.... In the horn section we tune fifths as pure as we can get them, and the thirds to sound "rich." Especially the sequence known as "horn fifths" which composers enjoy employing, sounds grand when done by a couple of horn players experienced enough with each other to tune those babies to impeccable degree. Barbershoppers work on pure intervals with almost every chord they sing. The "barbershop" ring has the stacked root, fifth, octave and octave + third of a chord tuned so that the harmonics sing like a fifth or even at times a six voice above. In a hall with any kind of acoustics at all the overtones sing as loudly as the musicians. Barbershoppers usually avoid learning their music with any keyboard such as a piano, in order to avoid the ET intervals which would interfere with the proper tuning of those "barbershop chords." And it is a glorious sound. The most wonderful sound I have ever experienced was 700 men singing a barbershop arrangement of the Lord's Prayer in an auditorium that seated about 600 people. I still get chills just remembering that overwhelming sound of pure intervals. Ed Carwithen John Day
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