Though jazz may be one of the most quintessentially American art forms, its influence and power naturally spread around the world in various forms.  In Great Britain, the popular Dixieland-inspired “trad jazz” (or “traditional jazz”) boom – epitomized by artists including The Three Bs: Mr. Acker Bilk, Chris Barber and Kenny Ball – was followed by a period of intense experimentation among jazz musicians  concurrent with the rhythm and blues and rock revolutions.  Rock and R&B artists, too, reciprocated as they incorporated jazz-based improvisation techniques into their own music.  Progressive jazz sounds…