In October of last year I had to replace my mid 2014 MacBook Pro with a late 2021 MacBook Pro with the Apple M1 Pro chip. This meant moving from the iTunes app to the new Music app. I add most of my music from my download folder to the Music app and it's saved to an external hard drive. Everything I add is always saved to the hard drive so access to the music is never a problem. Recently, when I opened the Music app, everything I had added since using the Music app was gone. All the music, all the playlists i created. The newest music & playlist in my library was from October of 2022 when I was using iTunes. I tried to start fresh with a new library, reloading everything on my external drive, but when I shut down the Music app, the library is blank, no files when I reopen the app. This is new as of this past week. I've had missing files before, but never the entire library.