Hi, I am aware that this is a very fundamental grammar question, please bear with me.

My question is pretty straightforward, it's just what the title says; is it grammatically incorrect to say "Who are coming?" or "Who are playing in that concert?"?

Now, I know a lot of people would say that it's wrong, and people usually say "Who's coming?", but what if the person's asking "Who are coming?" because he knows it's going to be people, not just one person?

I've googled this, and the answers on the internet did not explain this very well, that's why I'm asking here. Because we do say "Who are these people?" or "Who are they?", it's hard to just predicate that "who" is singular.

I will really really appreciate those who answer my question. It's been bugging me the whole day.Emotion: sad

Thanks in advance!
Anonymouswe do say "Who are these people?" or "Who are they?"
Here "these people" is the subject of the sentence.
And "they" is the subject of the second sentence.
AnonymousWho's coming?
Here "who" is the subject.

It's not a complete explanation, but it's a start.

That is incorrent.

"Who are coming?"

"Who are dying?"

"Who are singing?"

These are all incorrect, even when referring to multiple people.
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How do you know these are incorrect?

I ask because the question isn't explicitly addressed in any grammar books I currently owned. I'm simply told it's wrong (even though it makes absolutely unambiguous sense). Can you offer a common, definitive reference?
 CalifJim's reply was promoted to an answer.
Who are coming
Students: We have free audio pronunciation exercises.

When we use 'who' & 'what' to ask questions about the subject of a sentence, the verb
in the question is usually singular, even if the answer is plural:
What is cooking in the oven?
What was making all that noise?
The vegetables are cooking in the oven.
The neighbors' kids were making all that noise.

Who is coming?

They are coming

Who are they? Here are is referring to they.