Where to place my music files within Catalina 10.15.7

I have songs in my iTunes library that I imported from my CD's. I'm running Sierra on a 2014 MBP. My boys have their own Macs running Catalina with the app Apple Music 1.0.6.10. I am attempting to take the songs files I imported from my CD's and put them on their Macs so they can sync their Nanos along with any music they purchase themselves going forward from the iTunes store.

In the past, I would place the Artist Folder and Album Folder containing the m4a files in the iTunes Media or iTunes Music folder, then import using Add To Library in iTunes. For the Apple Music app in

Catalina, the folder structure has all changed. Now, within the iTunes Media folder, I see a folder for Music and one for iTunes. The Music folder only contains a Music Library file. I would presumably go to the

iTunes Media folder within the iTunes folder, but it contains folders named Automatically Add To iTunes, Automatically Add To Music, and Automatically Add To TV. I would like to put the music I own in the

correct folder so they can sync properly to their Nanos and continue to do so as they start buying their own music from the iTunes store.

I guess it's just a matter of my learning how this new OS thinks about and organizes music I've already purchased. Feel free to send a link to an article if you have one. Again, I know I'm a dinosaur in a streaming world. I appreciate any guidance. Thanks so much.