Polytonalist in live set (4)

I believe the answer is:

ives

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'polytonalist' is the definition.
I can't tell whether this defines the answer.

'in live set' is the wordplay.
'in' says the answer is hidden in the clue.
'IVES' can be found hidden inside 'live set'.

Can you help me to learn more?

(Other definitions for ives that I've seen before include "American composer of Three Places in New England, d. 1954" , "US composer, Charles" , "Saint of Cornwall or Cambridgeshire" , "Charles -, American composer (The Unanswered Question)" , "US composer, d. 1954 - US folk singer, d. 1995" .)

I've seen this clue in The Sun.

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