Crossword Genius

A musical tonic (7)

Ross

I believe the answer is:

keynote

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This clue might be a double definition.

'a musical' is the first definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'tonic' is the second definition.
(I know that tonic can be written as keynote)

Can you help me to learn more?

(Other definitions for keynote that I've seen before include "Gist" , "The central speech of a conference" , "Central theme" , "Determining principle in a speech" , "of fundamental importance" .)

I've seen this clue in the Evening Standard.
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