yes ,because the tea hall is large enough to acommodate a small stage for performing from opera to storytelling评书，or even acrobatics. it is just like bands in western restaurants. people can enjoy the performance when drinking tea. by the way ,they don't move stage to teahouse ,the stage is just there

it exists ,government is doing something. obviously it is not a question about language

they are the same meaning ,but different usage.耳is simple and also the etyma,rarely used as a single word in conversation , except in literature, in daily life when you want to say ear, use 耳朵。

you know chinese language is based on characters 汉字, one syllable can be several or a dozen different 汉字。 in your question zai4 can be 在，再，载，they all have respective meaning. i guess you may ask about 在 or 再。

想is more common than 愿意。when expressing your will about daily decisions ,想 is the first choice. 愿意 is formal,and often used in answering questions,like"你愿意什么什么吗？"

as far as i can see, 音乐（音樂）has the same meaning as "music" ,it includes any kind of music. 樂曲（乐曲）is more close to "melody", it means the music without lyrics; or broadly, the music part of a song ,but not the lyrics. songs are called 歌曲， or 歌。 so classical music is 乐曲。

今天下雪！到底怎么回事？！

今天只是10月29号，但是现在已经在下雪了。怎么到底回事？秋天好像不来了（more acceptable）！