Swinging London was a melting pot of fashions, styles, and sounds.  It was only natural that the cultural revolution and the youth movement would extend to the West End musical theatre.  1966’s On the Level was the second musical to open in London in as many years to concern itself with young adults in a school setting; the first was John Barry, Trevor Peacock, and Wolf Mankowitz’s Passion Flower Hotel a year earlier.  If that show had boldfaced names in John Barry, Jeremy Clyde (of Chad and Jeremy), and Barry’s wife Jane…