The original 2013 version of TOHO GENMUYOTAN's soundtrack shows you exactly which ZUN compositions each track is built from, and that transparency is kind of amazing. Every track title lists its source theme in parentheses, so you can hear how "佐渡の二ッ岩" becomes the foundation for 遠野舞 or how "千年幻想郷" gets reworked into 時代錯誤の摩天楼.
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The arrangements take these familiar melodies and stretch them into full RPG territory. "幻想少女達の激闘" pulling from 平安のエイリアン goes so hard it barely sounds like the same song anymore. These are love letters written in MIDI. If you want to hear ZUN's catalog reimagined through an RPG lens before the 2014 expansion, start here.