Turn-of-the-millennium club music exploding out of an arcade cabinet. beatmania IIDX 4th style dropped in 2001 and the tracklist reads like a DJ's crate from that exact era. "B4U" is pure early-2000s eurobeat adrenaline, the kind of track that makes your hands move before your brain catches up.
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"KAMIKAZE" lives up to the name with breakneck speed and zero mercy. Then "Clione" just floats in with this beautiful ambient trance vibe, translucent and calm like the sea creature it's named after. "サナ・モレッテ・ネ・エンテ" and "starmine" became series staples for good reason.
That 2001 arcade sound, where everything was eurobeat or breaks or hardcore or all three at once. If you want to understand where IIDX's DNA comes from, 4th style is essential listening.