From SkyTemple

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SkySongBuilder is a tool to build custom songs for Pokémon Mystery Dungeon: Explorers of Sky from various formats, including:

  • In-engine music from Soundfont2 and MIDI files
  • Streamed music from raw audio files (wav, mp3, etc.)

In-engine music is lower quality and has more limitations than streamed music, but has a much smaller file size than streamed music. Information on how to install and run SkySongBuilder can be found on it's GitHub repository.