MusicBee for music management. Especially since I ditched Spotify and came back to local music. See, there are two things that I want from a music manager software: good playlists management and the ability to transfer such playlists to a phone or portable music player. Sadly, none of the Linux apps come close to MusicBee (and I think that I've tried almost all of them).

Some, like Strawberry, have decent playlist capabilities, but fail when I try to send my music to my phone: either it doesn't detect it (I'm talking about using the USB cable and MTP) or throws an error when transferring the files. And there are certain bugs that haven't been solved. Others, like Pragha or Gapless, cannot transfer music. Lollypop is the most acceptable one, but its playlist UX is awful, and is slow AF when syncing with my phone. So, for me, MusicBee is the only software that I truly miss from Windows.

And no, I don't want to just copy the music using the file explorer. As I've said, I rely heavily on playlists, and this method doesn't work fine for that. For the same reason I don't use Syncthing.