Ok - sorry if this is long, but I just went through the upgrade to Catalina and it pretty bumpy (maybe user error) and I have a few thoughts on the new app coming from someone who's used iTunes for the last 12 years every day (event to listen to music).
Upgrade: So I upgraded from Mojave to Catalina with a carefully curated library with metadata, album artwork, and dozens of playlists with custom images. The upgrade actually went fine - upon first launch nothing had album art, but slowing everything populated. I used the settings to have all my music copied over from the iTunes directory structure to the default Music file hierarchy and everything seemed fine. So I copied this data and the new Music library file to another drive and wipe my iMac clean (I wanted to clean install Catalina and only did the upgrade to get Music set up).
Clean Install: After a very bumpy install process I began setting up my iMac and dragged all the Music library files and audio files. Upon launch everything was there, but there was no album art anywhere and no playlist art. It never loaded and when I went to "Get Info" it was present and I had to click and slightly drag the Album Art tab and then click "Ok" and it would populate, but I have hundreds of albums. I didn't realize that Album Art is now in a different library folder. Well I spent all last night and today trying to fix it: (1) Doug Apple scripts, (2) copying my old iTunes library to a Mojave computer and then updating that computer to Catalina and copying the Music library and library Album Art file, (3) "get album artwork" option in the application - nothing worked. The album art was still on my iPhone and iPad even after updating iCloud Music Library so it was solely the Music app. In the end I said "Screw it" and went one by one through hundreds of albums right-clicking, Get Info, Artwork, *jiggle the artwork metadata already there*, okay. I discovered the randomly like 20 albums simply had no album art at all. I kept a copy of all of my playlist image and one by one reapplied the album art. Now, the small subset of Apple Music songs that I had in my library also have no album art (not even in the Get Info area) and I can't edit those, so I'm just deleting all my Apple Music albums.
I think this process was ridiculously, but I'm willing to blame myself for the clean install, so other than the above, here are my thoughts on the application itself - I have a 70GB library (so small compared to many heart) of about 70% imported CDs and 30% iTunes purchases. Some thoughts for this new app compared to iTunes:
- The artwork in Album view is a bit too give, I wish I could make these thumbnails smaller and see more albums per screen. Also, what on earth is it fixed width? I take the Music app full screen on a 27" iMac and I have unused white space on both sides with a max number of album in a row (see screenshot). Why is this a limit?
- The UI is so gray and then that for the first time at a glance sometimes I don't realize that Music is the foreground application. I'll click it a few times before realizing it is the active application. The lyrics button and play button just look so faded to me.
- I don't like that the "Show Only Downloaded Music" option is now universal. In iTunes, I only wanted to see my owned (downloaded) music in Album view, but I had a playlist for all Apple Music albums I added to my library to try and keep AM a bit separate, but now I have to constantly toggle that button.
- I'm not a huge fan of how when you click on an Album you're taken to a view consisting of only that album and you can continue to scroll your library, but I can live with that. What I can't stand is why are songs not in two columns anymore if you have a large screen? As you can see in my screenshot, even in full screen I can only get a single column of songs in the Album view rather than the 2/3 columns before - which makes me scroll a lot in albums with 100+ songs.
- Random UI bigs. It will lag, sometimes flash when going between albums, and the animations are sometimes very abrupt.
Overall, I'm just shocked at how poorly optimized the Music app feels. Given that's supposedly just a variant of the iTunes code and that we're on 10.15.4 at this point, the Music app just feels like it was such an afterthought. It doesn't utilize screen space nearly as good as iTunes and just appears to be buggy. Usable, but buggy.
Thanks for reading my rant
Side-note: Why is my Magic Mouse lagging so much on Catalina?!