Your mathematical explanation makes sense.
Thanks a lot.

I play quite a bit of Italian music and I've been working on a version of Rocco Granata's 'Marina' for a number of years, but
without his signature accordion riffs, it just never sounded right. So the other day I'm doing another midi search for the song and came across a recent Youtube link.

Rocco is on an Austrian show called "Musikantenstadl" and performed 'Marina'.
He's got to be 80 years old and still sounds great.

Percy