What version of PMS are you using? What name/model NAS do you have?
When you’re at the point of deleting your music library and re-adding it,
we can have you do that again but in a specific order that cleans Plex
of it’s knowledge of your music. The procedure is called The Plex Dance ™
Let’s say you had three libraries that looked like
/share/Media/films
/share/Media/tv
/share/Media/music
Then when following the plex dance, you would move everything inside /share/Media/music
into a directory that Plex can’t access, but you would leave the music directory itself.