Constant of the people to accept sopranos in such music? (9)
I believe the answer is:
classical
'music?' is the definition.
(classical music is a kind of music)
'constant of the people to accept sopranos in such' is the wordplay.
'constant' becomes 'c' (common symbol in maths for an unknown constant).
'of the people' becomes 'laic' (I've seen this before).
'to accept' is an insertion indicator.
'sopranos' becomes 'ss' (a musical abbreviation for soprano written twice).
'in such' becomes 'al' (I can't explain this - if you can you should give a lot more credence to this answer).
'laic' placed around 'ss' is 'lassic'.
'c'+'lassic'+'al'='CLASSICAL'
Can you help me to learn more?
(Other definitions for classical that I've seen before include "from 1750 to 1800" , "Relating to ancient Greek and Latin cultures" , "Like ancient Greek or Roman art" , "Of recognized excellence, music perhaps" , "Traditionally accepted" .)