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?
Barbershop music
Barbershop vocal harmony, as codified during the barbershop revival era (1930s–present), is a style of a cappella close harmony, or unaccompanied vocal music, characterized by consonant four-part chords for every melody note in a predominantly homophonic texture. Each of the four parts has its own role: generally, the lead sings the melody, the tenor harmonizes above the melody, the bass sings the lowest harmonizing notes, and the baritone completes the chord, usually below the lead. The melody is not
about it now is that we actually got a call from Barack Obama's people saying they'd heard the song, they felt its theme really suited their campaign, and that they'd love to feature it on their fundraising record 'Yes We Can; Voices Of A Grass Roots Movement'! You know, as soon as they told me that, I was like 'You don't even have to ASK! You can use ANY of my songs for ANYTHING to do with Barack Obama!'!"
Music video