what if it were possible to be allergic to music or certain sounds.

Certain sounds, yeah.

Had the hives too. It was Beyonce playing.

I don't think it's impossible because misophonia is real and it's triggering stress reaction, so if someone breaks out in hives under the stress then they as well might. 😅

There was a woman who had seizures every time she heard a certain woman singer singing a certain song on the radio. I remember a news story about that a long time ago.

She’s enough to make anyone break out into hives.