Unofficially, a boy group is a vocal ensemble made up of young male vocalists, typically in their teens or early twenties at the time of creation, who sing love songs targeted toward young women. Many boy bands perform with dancers as well as singers, sometimes in elaborately planned shows.
Some of these bands are created on their own, frequently emerging from church choirs or gospel music ensembles. Others, though, are made following auditions by record producers or talent managers. The majority of boy bands are vocal ensembles, hence neither during recording sessions nor live performances do they play any instruments.
In terms of ideas, they are comparable to their girl group counterparts. Boy bands have experienced three popularity peaks: the first was in the 1960s to 1970s; the second was in the 1990s, when acts like Westlife, New Kids on the Block, Take That, Backstreet Boys, NSYNC, and Take That dominated international pop charts; and the third was from the 2010s to the present, when boy bands like One Direction and K-pop acts like BTS began to gain popularity.
The first a cappella barbershop quartets, which were the forerunners of boy band music, appeared in the late 19th century. They often sang in four-part harmony and were a group of guys. Barbershop quartets were in demand throughout the early 20th century. In the late 1940s and 1950s, the male vocal group saw a renaissance with the help of doo-wop music. Doo-wop groups sung about love and other common pop song themes.