There's https://www.strawberrymusicplayer.org/, a fork of Clementine, apparently created due to Clementine's inactivity. I've used it on and off on MacOS, but had some nasty locks which crashed the application.
But speaking of Clementine: I'm amazed that development seems to have picked up again, commits are happening on Github ( https://github.com/clementine-player/Clementine)
Last time I checked the repo it was silent.
Yeah, i used qt6ct to setup a dark theme.
Only, parts of colors are applied on my arch system.
The funny thing is it looks good, while qt6ct is open.
when i close qt6ct, it reverts to a mix of colors from the theme and the default colors.