If you're using gnome as desktop, you should seek for gstreamer compatible plugi...

If you're using gnome as desktop, you should seek for gstreamer compatible plugins:

I'm using Fedora rn, so I adjusted the packages names and did something similar to the arch wiki, so I'm not sure the closest ones for Ubuntu.

I find VLC ugly, but if you can live with it, just install the vlc plugin like a sibling post here said.

Fluidsynth is amazing and I'm using it to emulate a decent enough synth for dosbox games.