Music should use tracker. It plays music fine. It downloads covers well. It sucks when discovering music files. My music files are all neatly saved in /home/user/Music. The only way to check if I have a particular song or album or music artist is if 1) I open Rhythmbox, which "discovers" music well (manually) 2) if I search in nautilus, the file browser in GNOME and 3) if I use tracker CLI in the terminal.
There's a ton of music files not showing up in Music.
I like that it has last.fm in gnome-accounts. It gave me a smile when I discovered that songs I played in Music shows up in my last.fm recently played list. Yes I remember that I allowed last.fm in the accounts.