From how few local young bands even have ANY kind of keyboard player that I've seen in my area, I'd have to say the average age of ALL keyboard players is going up, here in the US!

Sometimes one of the guitarists will have a little 37 note arp player or something like that for a few songs, but I've definitely noticed a downward trend in keyboard playing. Good news for me, of course! I'll still be playing in bands until I croak at this rate, with no-one to replace me and push me aside!

Guess every cloud has a silver lining!
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An arranger is just a tool. What matters is what you build with it..!