Classical music gets absolutely dunked on in the best way possible. Konami took pieces by Beethoven, Strauss, and others, then ran them through a shmup blender with the goofiest FM synthesis arrangements imaginable. "Crisis 4th Movement" rips through Beethoven with arcade energy that has no right to slap this hard.
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"Even Pierrot Gets Angry" goes full carnival chaos. The boss themes are punchy and ridiculous in equal measure. Every track sounds like the composers were having the time of their lives. It's Gradius if Gradius stopped taking itself seriously and started wearing a penguin suit.
If you want to hear what happens when a shoot-em-up decides to be genuinely funny, start here.