It seems you need to read the passage. Sorry but please include a text.
Following the construction of his opera house, Richard Wagner placed his orchestra "under the stage."
This is because his orchestra tended to overpower the singers of his operatic productions.
Richard Wagner was known for revolutionizing opera when he described his work as Music Drama.
His opera house was named Bayreuth Festspielhaus
The opera house was opened in 1876.
Hence, in this case, the correct answer is "Under the Stage."
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