Oh Yeah!!!
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As the Avant Garde movement tore down every wall of the old establishment, only one rule that had stood from the very inception of jazz remained: no accordions.
~ Genius Guide to Jazz, May 2001
You are wrong there, Alan. There are some great jazz piano accordion players and I've even be known to play blues and 'Take the 'A' train' on my melodeon. Succeeded in annoying my Morris side. ;}