It comes from the Operetta, Comedy and the Minstrel Shows in the nineteenth century, which ushered in the golden era in Broadway and in the western area of London in England.
它起源于十九世纪的轻歌剧(Operetta)、喜剧(Comedy)和黑人剧(Minstrel Shows),在美国百老汇和英国伦敦西区迎来它的黄金时期。
参考来源 - 音乐剧《歌剧魅影》音乐研究