Crossword Genius

Sacred performance changing rate, or otherwise (9,5)

Ross

I believe the answer is:

gregorian chant

'sacred performance' is the definition.

'changing rate or otherwise' is the wordplay.
'otherwise' indicates an anagram.
'changing'+'rate'+'or'='changingrateor'
'changingrateor' is an anagram of 'GREGORIAN CHANT'.

(Other definitions for gregorian chant that I've seen before include "Medieval plainsong" , "variety of plainsong" .)

I've seen this clue in The Telegraph.
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