Following music, look at prominent organ (3-3)

I believe the answer is:

pop-eye

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But I can't explain it at all! Could you help me understand?

(Other definitions for pop-eye that I've seen before include "Spinach-loving sailor" , "Spinach-dependent cartoon sailor" , "Cartoon hero" , "Bluto's rival" , "Spinach-eating cartoon character" .)

I've seen this clue in The Times.

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