[Answer] Which is NOT a common feature of an opera production?

Step 1 : Introduction to the question "Which is NOT a common feature of an opera production?"

...Opera is probably best described as a drama set to music. The main focus of an opera is its vocal elements, which are sung completely live with no assistance from microphones or other amplification devices. Opera singers have a unique task: singing over a full, live orchestra loudly enough so that the audience can hear them. To do this, they actually sing at a sound frequency that allows them to overpower the music in the background.

Step 2 : Answer to the question "Which is NOT a common feature of an opera production?"

Microphones:

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