Bagpipe parts required for the church choir (8)

'bagpipe parts' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'the church choir' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'church' could be 'ch' (common abbreviation) and 'ch' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'required for' is the link.

Can you help me to learn more?