That distorted guitar intro on Rewrite is burned into the brain of every Fullmetal Alchemist fan alive. ASIAN KUNG-FU GENERATION's Sol-fa is peak 2000s Japanese rock, and the anime community claimed it permanently. Re-Re became the Erased opening years later and somehow hit even harder the second time around.
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Loop & Loop has this driving, anxious energy that just builds and builds without letting go. Last Scene pulling back into something quieter and more reflective. The whole album runs on this restless, post-punk-influenced sound that feels like skateboarding through Tokyo at night.
If you grew up on mid-2000s anime openings and never checked out the full albums, start here.