Crossword Genius

Seeking out a key for what's melodically memorable (8)

Ross

I believe the answer is:

haunting

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'memorable' is the definition.
(haunting can mean evocative or memorable)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for haunting that I've seen before include "Poignant, evocative" , "Ghost visitation on ninth Aug" , "Willing to take chances" , "Visiting as a ghost" , "Frequenting a place, as a ghost might" .)

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