Well, yes, with opera of course, but the other eighty percent is purely instrumental music.

没错,歌剧中是有歌词的,但其他百分之八十的古典乐都是纯器乐

耶鲁公开课 - 聆听音乐课程节选

And it begins with an auctioneer selling various articles from the old opera house.

刚开始的时候就是一个拍卖家在卖老歌剧院的各种物品。

歌剧魅影 - SpeakingMax英语口语达人