Games with YXG soundtracks:
Setting up MIDI for music making.
I had these videos bookmarked, they're all by popular Youtubers:
Personally I use a Roland USB→MIDI cable to communicate between my computer and an 8-in/8-out MIDI Router, and everything else goes into that router too. I find the MIDI Router such a hassle saver, you just tell it what signals to send where. You can get old ones like mine for $100 and less, or new fancy ones for much more if you really want. If you want to record audio on your computer get an audio interface in place of the Roland cable.
I'm using Reaper to send Sysex messages for synths that need them (mostly the yamaha_tx81z), but some other options for Linux are:
I'd thought VLC had dropped support for MIDI, but I've found it to be the easiest way to get hassle-free MIDI playback.
Tools > Preferences > Input/Codecs > Audio codecs > FluidSynth
Now you can play a MIDI file just like it's any other audio or video file :)