Overriding Score.SystemStartBar once at the beginning

[jasonflatley]

I am trying to make a jazz lead sheet template. One requirement is that the
treble clef and key signature should only appear in the first system, and
the subsequent systems should begin with a bar line. This picture shows what
I have so far (generated by the lilypond code at the end of this message).

<http://lilypond.1069038.n5.nabble.com/file/t5643/first_system_bar_line_example_%28Small%29.png>
 

I don't want the bar line at the very beginning, to the left of the treble
clef.

So I tried to override Score.SystemStartBar for just the first system. I
tried various permutations of \override and \once in either the layout block
or near the %%% in the melody section, using statements like the following:
--\override Score.SystemStartBar #'collapse-height = #30
--\override Score.SystemStartBar #'X-offset = -10
--\override Score.SystemStartBar.break-visibility = #'#(#f #f #f)

I can't seem to override anything once, and then set it back.

Any suggestions?

----------------

\version "2.18.2"

\header {
title = "First System Bar Line Example"
}

\paper {
indent = 0\mm
}

\layout {
\override Score.Clef #'break-visibility = #'#(#f #f #f) % make only the
first clef visible
\override Score.KeySignature #'break-visibility = #'#(#f #f #f) % make only
the first time signature visible
\override Score.SystemStartBar #'collapse-height = #1 % allow single-staff
system bars
\context {\Score \remove "Bar_number_engraver"}
}


melody = \relative c'' {  
  
%%% Try to put something here to make just the bar line to left of treble
clef disappear

\numericTimeSignature
c4 c c c 
c c c c
c c c c
c c c c \break

c4 c c c 
c c c c
c c c c
c c c c \break

c4 c c c 
c c c c
c c c c
c c c c \bar "|."

}


\score {<<\new Staff { \melody }>>}




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