I have hearing loss due to Meneres disese. I had to purchase hearing aids and after getting them I noticed that sometimes
I could not hear the proper key that a song was playing in.
I had problems with pitch. Later on I purchased different
hearing aids and that helped a lot.
I still sometimes have difficulty recognizing what key a song is playing in but it disappears after a short time.
I used to have perfect hearing and being a musician this has been a very tough situation to put up with.