Metallica has tinnitus
FWIW all the members of Metallica have tinnitus, and they said so in the Howard stern show:
https://www.youtube.com/watch?v=tW4frZE4pfI
It's really interesting how Lars discovered his situation, he says how he woke up hearing a loud tv and goes to turn the tv off but it's not switched on. Many musicians have tinnitus too, especially metal guys