> - MusicBee. There just does not seem to be a good music manager for Linux that can replace MusicBee. I rarely use it as a music player, there are dozens of great options for Linux music players, but MusicBee feeds my Airsonic instance, and I have not found a good way to manage music graphically in a way that maintains this setup.

For a traditional "all batteries included" collection management music player try Strawberry and Quod Libet. You should also look into the MuiscBrainz Picard tagger, it's a bit unwieldy to use but is very powerful once you learn it's wonky workflow.

Hadn't heard of Quod Libet, that's a good recommendation!