No time signature or bar lines

[ivan . k . kuznetsov]

I need to create musical examples for instruction
and many of these ideally would have no bar lines
or time signatures.  Appended is such an example.
  
  
(1) the example below is pretty much what I want expect
that there is space where the time signature would normally go 
(I erase the time signature with
"\override TimeSignature #'transparent = ##t" but the space
is still there). 
    
How can I get rid of this space?
  
(2) Are the \cadenzaOn and \cadenzaOff tags the standard way to
write musical examples without bar lines or are there
other ways that might be preferable in such examples?

Thank you for your help.
  

%%%%%%%%%%%% BEGIN EXAMPLE %%%%%%%%%%%%

\version "2.16.0"
\include "english.ly"

\score { % score

  \new Staff
  {
  \time 4/4
  \key c \major
  \clef "treble"
    \cadenzaOn
     a1    b1
     c'1   d'1   e'1   f'1   g'1   a'1   b'1
     c''1  d''1  e''1  f''1  g''1  a''1  b''1
    \cadenzaOff
  }

  \layout {

    \context {
       \Score
       \override TimeSignature #'transparent = ##t 
    }
  }

} % score


%%%%%%%%%%%%% END EXAMPLE %%%%%%%%%%%%%