But those are pianists, not keyboard players...

I don't think I've seen ONE front person do anything but piano, or maybe a Wurli or Rhodes (rare) from the current generation. Sure, they are ALL playing them in the studio (or their producers are!) but you won't see a synth solo or organ ride or basically, anything but them dance around. I definitely DO thank God I grew up when being the band's keyboard player COULD get you laid wink
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An arranger is just a tool. What matters is what you build with it..!