Do you know anything about Barbershop music?
Yes, it is a style of cappella close harmony music!
How far back can we trace it's origin?
Well, its emergence can be traced  back to during the barbershop revival era in 1930s–present
Wow amazing, which country did this originate from?
It has origins in western Europe, when Sweet Adelines quartets", was coined in association with the organization of that name at that time. 
Did any of the popular genre we have today evolve from Barbershop music ?
A cappella
A cappella ( , ; Italian for "in the manner of the chapel") music is specifically group or solo singing without instrumental accompaniment, or a piece intended to be performed in this way. It contrasts with cantata, which is usually accompanied singing. The term "a cappella" was originally intended to differentiate between Renaissance polyphony and Baroque concertato style. In the 19th century, a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the
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