The role of Sammy Nestico for Count Basie's band, and Nelson Riddle for Frank Sinatra (8)

I believe the answer is:

arranger

(Other definitions for arranger that I've seen before include "One adapting music for different forces" , "One planning" , "Musician" , "Orchestrator" , "One adapting a piece of music" .)

I've seen this clue in The Times.

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