MIDI

[ipochto]

for current SDL_mixer:
need to set environment variable SDL_SOUNDFONTS=/usr/share/soundfonts/FluidR3_GM.sf2 ./program

OR switch to another mixer:
https://discord.com/channels/780082494447288340/780082494447288344/908649843361189889
https://wohlsoft.github.io/SDL-Mixer-X/

Switch to SDL Mixer X (Or “MixerX” shortly) - An audio mixer library based on the SDL library, a fork of SDL_mixer to enable better MIDI music support.
Now war1gus don't convert midi to ogg anymore. So if you need music you need propper midi support. SDL2_mixer has issues with it.