Hearing congrats, perhaps, for church songs (9,6)

I believe the answer is:

gregorian chants

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'church songs' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Perhaps you can see an association between them that I don't see?

'hearing congrats perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'hearing'+'congrats'='hearingcongrats'
'hearingcongrats' with letters rearranged gives 'GREGORIAN CHANTS'.

'for' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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