Reach the heights in music? (5)

I believe the answer is:

scale

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'reach' is the definition.
(I know that scale is a kind of reach)

I don't understand the rest of the clue.

(Other definitions for scale that I've seen before include "Alec's (anag) -- graduation" , "Relative magnitude" , "Plate protecting the skin of fish and reptiles" , "A fish flake" , "Graduated table" .)

I've seen this clue in The Globe and Mail.

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