From Wikipedia: The earliest form of boy band music took place in the late 19th century with the use of a capella Barbershop quartets. They were usually a group of males and sing in four part harmonies. The popularity of Barbershop quartets had been prominent into the earlier part of the 20th century. A revival of the male vocal group took place in the late 1940s and 1950s with the use of doo-wop music. Doo wop was a predecessor to the previous boy bands and they sung about topics such as love and other themes used in pop music. The earliest traces of boy bands were in the mid 1950s although the term boy band was not used. The Ink Spots was one of the first of what we would now call boy bands. The term boy band was not established until the late 1980s, as before that they were called male vocal groups or harmony singing groups.

I'm sorry,Andrew. Maybe I should ask "From Beatles or Take that all started?" ( new style, era...in music)

What do you mean by "the boys" ? Please use more words to explain your thought.