Well-known - like scores of orchestral pieces (5)

I believe the answer is:

noted

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'well-known' is the definition.
(I know that well-known can be written as noted)

I don't understand the remainder of the clue.

(Other definitions for noted that I've seen before include "Gaiter; oyster spawn" , "Famed" , "Scores like this" , "written down" , "prominent" .)

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

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