I was surprised not to find cantata[1], another MPD graphical client, on the list. Used it for the past three years, despite it being unmaintained for quite some time now. The client is very featureful, allows downloading lyrics and covers automatically (TBF had many mismatches, like downloading some Gillette ad as an Eminem's album cover). Most important to me is the ability to listen do directories and not artists/albums, which cantata does perfectly. Recently nixpkgs replaced cantata with a fork[2], so cantata is kind of online again.

[1]: https://github.com/CDrummond/cantata

[2]: https://github.com/nullobsi/cantata