You know, some people have referred to the Beatles as a boyband (Ugh), and I guess, if you want to get technical, you can go back to early doo wop or the harmony pop groups of the fifties like the Four Aces for example.
Anyway, assuming you are omitting bands like the Beatles and Hollies from this list (and I hope you are), does that mean we have to endure, ugh, the Osmonds?