consider sounds created by (a) a flute continuously sounding a steady town, (b) a struck xylophone bar, (C) a steadily bowed violin, (D) a snare drum, (e) a steadily blown oboe, and (f) a struck piano string. In view of the rules in section 8.2, in which three cases is the vibration recipe required to be precisely a harmonic series? IN which three is it permitted to be nonharmonic? In which of the last three is it nevertheless probably quite close to harmonic and why?