People play them in ones and twos (7)

I believe the answer is:

sonatas

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'people' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sonatas that I've seen before include "musical items" , "10 [COMPOSITION]s" , "Classical pieces" , "Instrumental compositions" , "eg Moonlight and Waldstein" .)

I've seen this clue in the Evening Standard.

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