iTunes Library is grayed out in Apple Music macos Big Sur after High Sierra upgrade

after making a new Music library (Big Sur) in its default location User>Music>Music>Music Library.musiclibrary

• i created a new Music Library.musiclibrary on the external hard drive > inside the old iTunes folder, (you'll have to navigate to your iTunes folder on your external hard drive)
• the Music app created a new folder named ‘Music 1’ & also created a new library there named it ‘Music Library.musiclibrary’
• quit the Music app

to open the new Music Library that contains all of the music do the following,

• navigate to the external drive (make sure it is mounted), then navigate to iTunes>Music 1>Music Library.musiclibrary & double-click the new ‘Music Library.musiclibrary’ file

the Music app will reindex the iTunes folder making your music accessible in the new Music app & also create a new media folder which you can confirm in Music>Preferences>Files>/Your External Hard Drive/music (my folder)/iTunes/Music 1/Media

the old way was to option-open iTunes & navigate to the iTunes folder but this has changed.

now you can just double-click .musiclibrary file located in your external hard drive

verification below:

thank you jmarse1 :)

the iTunes Library did not have the ‘.itl’ extension

but,

‘iTunes Library Extras.itdb’ & ‘iTunes Library Genius.itdb’ did.

thanks again for your reply :)

v :)