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Second experiment, soprano unused in choral music (5)

Ross

I believe the answer is:

motet

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'music' is the definition.
(I have seen 'sacred music' mean 'motet' so perhaps 'music' could also mean 'motet')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for motet that I've seen before include "Polyphonic choral liturgical piece" , "Short sacred choral work" , "Church composition - totem (anag)" , "Musical composition" , "Church choral composition" .)

I've seen this clue in The Times and The Sunday Times.
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