\version "2.18.2"
\language "english"
\score {
  \new StaffGroup <<
  \new Staff {
    \language "english"
    \clef "treble_8"
    #(define RH rightHandFinger)

    \new Voice \with {
      \remove "Note_heads_engraver"
      \consists "Completion_heads_engraver" completionUnit = #(ly:make-moment 1/2)
      \remove "Rest_engraver"
      \consists "Completion_rest_engraver" completionUnit = #(ly:make-moment 1/2)
    }
    {
    %% (guitar music)
    %%
    %% With "Completion_heads_engraver",
    %% ties across the bar line or the "moment"
    %% generate repeats of markings for:
    %% bow, left-hand finger, circled string,
    %% and right-hand "p"
    %%
      <c\6\downbow-4\RH #1 >8
      r4
      <d\5\downbow-1\RH #1 > 
      <d\5\downbow-1\RH #1 >
      <d\5\downbow-1\RH #1 >
      <e\upbow-3\RH #1 >
      <f\downbow-4\RH #1 >
    }
  }
  \new Staff {
    \language "english"
    \clef "treble_8"
    #(define RH rightHandFinger)

    \new Voice \with {
      \remove "Note_heads_engraver"
      \consists "Completion_heads_engraver" completionUnit = #(ly:make-moment 1/2)
      \remove "Rest_engraver"
      \consists "Completion_rest_engraver" completionUnit = #(ly:make-moment 1/2)
    }
    {
    %%
    %% The same as before but notes not grouped
    %% with the < > symbols.
    %% Bow and left-hand fingers now correct,
    %% but still generate repeated circled string
    %% and right-hand "p" markings
    %%
      c8\6\downbow-4\RH #1
      r4
      d\5\downbow-1\RH #1 
      d\5\downbow-1\RH #1 
      d\5\downbow-1\RH #1 
      e\upbow-3\RH #1 
      f\downbow-4\RH #1 
    }
  }
  \new Staff {
    \language "english"
    \clef "treble_8"
    #(define RH rightHandFinger)
    \new Voice {
    %%
    %% Without "Completion_heads_engraver",
    %% the markings are correct and are not repeated across bar lines
    %% (tie across bar must be explictly specified)
    %%
      c8\6\downbow-4\RH #1
      r4
      d\5\downbow-1\RH #1  
      d\5\downbow-1\RH #1 
      d8\5\downbow-1\RH #1 
      ~
      d8
      e4\upbow-3\RH #1 
      f\downbow-4\RH #1 
    }
  }
>>
  \layout { }
}