Strawberry

Strawberry is a Qt6 fork of Clementine (whose last release was 2016 w Qt4 I believe). It's HOT SHIT! Nearly everything I wanted Hang The DJ to be. Let's jump in and expand it some day!

Install

Grab a deb from here
Put it in ~/apps and install it.

cd ~/apps && sudo apt install ./strawberry_0.9.3-focal_amd64.deb

Configure

I had to pick this for sound output on cast:

Tools > Settings > Backend > Audio output >
  Engine: GStreamer (only choice)
  Output: Output to a sound card via ALSA
  ALSA plugin: ( ) hw  (o) plughw (change from hw default!)