The X68000 version of Gradius II already had the original credit music arranged in MIDI. However, it's still the same short version found in the arcade version, probably because the credits weren't as long as the one in the Famicom version so there's really no reason to arrange that version.
So here's a MIDI version for the Famicom Farewell being played back on Sound Canvas VA with SC-55 mapping. Obviously it's not the same arrangement as the X68000 MIDI version, and I don't have the necessary skill to replicate Konami Kukeiha Club's style completely.
Game footage is from the PCE version.
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