How about that Barbershop music?  It's an interesting sound.
I agree, the harmonization is so nice to hear, don't you think? 
Indeed.  I wonder what the largest Barbershop music group is.
I'm not sure, but there is a Barbershop Harmony Society that promotes the art.
Oh cool.  Do you know when the Barbershop Harmony Society started?
Barbershop Harmony Society
The Barbershop Harmony Society, legally and historically named the Society for the Preservation and Encouragement of Barber Shop Quartet Singing in America, Inc. (SPEBSQSA), is the first of several organizations to promote and preserve barbershop music as an art form. Founded by Owen C. Cash and Rupert I. Hall in Tulsa, Oklahoma in 1938, the organization quickly grew, promoting barbershop harmony among men of all ages. As of 2014, just under 23,000 men in the United States and Canada were members of this organization whose
of one or two barbershop songs with a personalized card and either roses or chocolates.
Song selection.
Each chapter is free to choose their own music. For male barbershop chapters, the typical two song selection is:
- "Heart of My Heart, I Love You" (the chorus from "the Story of the Rose"), and
- "Let Me Call You Sweetheart"
There are standard barbershop arrangements for these two songs from the Barbershop Harmony Society collection of twelve "polecat songs"