One of the more striking features of doo-wop is its use of falsetto. That carried on into the Beach Boys (along with the harmonies), and into Motown (think Smokey Robinson), and has become established as an "option" in mainstream pop. Before doo-wop came along, falsetto seemed to be used only in "marginal" music such as Delta blues and Native chant; of course, doo-wop started out marginal.