content: -- This handler takes a script object (singer)
  -- with another handler (call).
  on sing about topic by singer
      call of singer for "Of " & topic & " I sing"
  end sing
  
  -- Define a handler in a script object,
  -- then pass the script object.
  script cellos
      on call for what
          say what using "Cellos"
      end call
  end script
  sing about "functional programming" by cellos
  
  -- Pass a different handler. This one is a closure
  -- that uses a variable (voice) from its context.
  on hire for voice
      script
          on call for what
              say what using voice
          end call
      end script
  end hire
  sing about "closures" by (hire for "Pipe Organ")
  