omit the rest at beginning of staff

[Jinsong Zhao]

Hi there,

In the following snippet, is it possible not to display the r2? Any 
hints or suggestions will be really appreciated.

Thank you very much!

Best,
Jinsong


\version "2.19.18"

song = \relative c'' {
  \clef "treble"
  \key c \major
  \time 4/4
  r2 e,4 f \bar "||" \mark \markup { \musicglyph #"scripts.segno" } g2 e' |
}

RH = \relative c'' {
  \clef "treble"
  \key c \major
  \time 4/4
  r2 e,4 f | g2 e'
}

LH = \relative c'' {
  \clef "bass"
  \key c \major
  \time 4/4
  r2 c,,4 d | < c e > g' g, g' |
}

\score {
  <<
    \song
    \new PianoStaff <<
      \new Staff <<
        \RH
      >>
      \new Staff <<
        \LH
      >>
    >>
  >>
}