Just stab them in the throat with the forks instead.

They won't stop if you tell them you have a really bad migraine???? Idk what kind of people would keep just keep singing..

Just take care OP..

Earplugs instead of forks?

Was one playing Happy Birthday on their guitar?

I'm kind of curious what the context is here. Is this at home, or elsewhere? And who are the people singing?

If your migraine was that serious you wouldn't be cooking dinner

Are they your children?

It's likely they aren't actually "tone deaf" because that's a very rare medical condition in which people can't hear the difference between different pitches. Many people who sing out of tune can practice matching pitches while singing, and if you can find a good way to suggest it you can end your misery and likely some of theirs!

Not only "why won't they stop singing," but why are you cooking? Are these individuals children? Because if they're adults they can cook for themselves while you lay down in a quiet, dark room.