ZUN decided to bring the occult to a fighting game and the soundtrack goes accordingly hard. This is the Urban Legend in Limbo OST, Touhou 14.5, and it splits into original tracks and arrangements of classic Touhou themes with heavier, guitar-driven energy.
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Last Occultism is Sumireko's theme and it absolutely rips, this frenetic piano-and-melody combo that feels like the final boss of the entire outside world. Battlefield of the Flower Threshold has this urgency that keeps building without ever letting up.
The arrange disc pulls in older favorites and gives them a grittier edge. Multiple doujin arrangers contributed official tracks here, which is kind of unprecedented for the series. If you play Touhou fighters and skip the OST releases, you're missing the real content.