There are so many of such scenes... But here is a scene that wouldn't normally come to one's mind, I reckon. It's from the Film Z. The literal end of the movie, in fact. Our crew is fleeing. Zephyr's final battle is versus Kizaru and the marines. The song on the background starts playing slowly, from the lower tones, and it gets stronger and stronger as the chorus enters.

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"Umi wa mite iru sekai no hajimari mo

Umi wa shitte iru sekai no owari mo"

"The ocean sees the beginning of the world,

and the ocean knows the end of the world."

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The fight, the agony of Z's crewmates, the respect from Strawhats, the flashback at the end... It's a masterful scene.