Barbra shop music is one of my favorite it is mostly song in Capella close harmony
Do you mean barbershop music?
yes, Barber Shop harmony is the use  of shakes and swipes 
Oh yea I am very fond of it. Do you know any famous bands that play such music?
The Sweet Adelines  Quartets
Yes I can recall listening to them. What else do you know about barbershop music?
Barber shop music experienced a revival in the 1930s
What are some of the features of this music?