Well, that makes sense

He could still kinda listen by biting a tuning fork

Given his deafness was caused by lead exposure, and we have hearing aids we could probably give him some hearing back to an extent

He wasn't deaf from the beginning, though...

They all laughed when Beethoven told them he wanted to be a musician!
"Beethoven" they cried, "You are deaf! You will never be musician!"
You know what he said?
"I. Can't. Hear you."

There’s music for deaf people now. It’s mostly Christian music, but there’s deaf bands too

Probably rock or something with heavy percussion.

lol he would listen to X

You can stretch to believe that he could be reincarnated but not that he could have his hearing restored?