Music we all need (3)

I believe the answer is:

air

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'music' is the definition.
(air is a kind of music)

I don't understand the rest of the clue.

(Other definitions for air that I've seen before include "put on radio?" , "in which birds fly around" , "Light breeze" , "Bearing, manner" , "Spread publicity" .)

I've seen this clue in the Evening Standard.

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