90 year olds didn't reach their prime until 40 years old? LOL
Most of us, as we get older and more calcified (count me in!) tend to return to the songs from their teens and twenties, MAYBE 30's too. And also songs we remember OUR parents listening to when we were young.
So, your average 80 year old was listening to 60-70 year old music early on (and their parent's too). This is squarely in big band years.
Heck, I grew up listening to it and I'm not yet in my 60's! Don't forget, Basie, Ellington and many more were still performing into the 60's and even 70's.
But yeah, I'd want the feature for TOP, EWF, Chicago, and a million funk and reggae tunes. But I still like to jam a little Miller when I'm at the house and no-one's listening! Check out the BK-9 factory Performance list for the one for American Patrol... Nails it!
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An arranger is just a tool. What matters is what you build with it..!