There's a countertenor instead of an alto.
Twenty years ago, or so, Rob and I took Richard’s mother to a Messiah performance where they did that and she DID NOT APPROVE. When it was over, she wouldn’t even clap. I was so embarrassed by her behavior I drove her home in silence.
The next day she was ranting to her musician eldest son. He told her there was probably some historic validity to that choice, but she still wasn’t convinced.
Have I mentioned my mother-in-law was a force of nature?