单项选择题
A．music composers B．traveling musicians C．amateur theater groups D．performer's relatives and friends
A．Oratorio performers and their audience. B．Differences in music audiences. C．The rise of amateur choral societies. D．Community receptivity to musi
A．They are primarily performed by professionals. B．They vary little from one performance to another. C．They are composed entirely of solos. D．They are carelessly schedule