Completely agree, Ian. But IN THIS CASE, I'm sorry, but the 'historical' implications completely slipped by me.

If Keith had have been the SLIGHTEST bit interested in the arranger itself, perhaps he would have quit noodling EWF on those scat sounds, and tried some of the jazz and fusion backing styles?

Main thing about arrangers being used by writers and composers of any standing is, I can GUARANTEE that, by the time the song gets recorded for release, REAL musicians are playing all the parts. That's the difference between THEM and US, I guess!
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An arranger is just a tool. What matters is what you build with it..!