I have been accumulating iTunes music tracks for over twenty years with a current and growing total of over 15,000 multiple genres.
Many purchased from Apple iTunes store, many ripped from purchased CDs and/or public library files.
Considering the numerous posts about iTunes, Music and general issues with Catalina including .2, I can't imagine a sane collector of significant music files even considering updating to Catalina at present.
When someone can tell me they have large files like mine, have upgraded to Catalina and have their music experience operate as good or better than Mojave, retaining album art, playlists and genius lists, causing no problems syncing their music to an iPod Touch, Classic or iPad, i'll start listening to comments.
Already over the years, the iTunes store has "forgotten" several albums I purchased several updates ago and will no longer "Complete your album" of some of them of which I initially purchased partial albums.
My music is one of the most core functions of my Apple environment of two iMacs, about a dozen assorted iPods and Pads.
It's all backed up periodically to Time Machine and the Cloud (about which I've seen Catalina gripes), a second external hard drive, an off-line hard drive and DVDs.
Even so, I'm waiting a long time with Mojave which is pretty stable and has a usable iTunes function.
My music works OK on all the mobiles, so clearly the group that does IOS is much better than the Catalina team. MACOS is huge and complex, but updates shouldn't be released with widespread, significant bugs. Apple has very deep pockets, and needs to buy some better MACOS QC instead of trying to compete with Disney, Comcast, etc. and buying sideline twerks like Beats and Dr. Dre.
Fix your computers, Apple. Leave entertainment to the entertainment professionals