arpeggios as barre indicators

[Eluze]

based on the snippet "Cross-staff arpeggio brackets" in the LSR I found a
nice way to mis-use arpeggios as barre indicators

hilites:
- you don't even need chords for the arpeggio and
- you can combine notes/chords with different durations!

arpeggioAsBarre = \once \override Staff.Arpeggio #'stencil =
#ly:arpeggio::brew-chord-bracket

\markup { "6 or 3 voices/notes with a barre on the 3rd fret"}
\score {
  \context Staff {
                \set Staff.connectArpeggios = ##t
    <<
      \context Voice="1" { \voiceOne   \arpeggioAsBarre g'' \arpeggio s
\arpeggioAsBarre g'' \arpeggio }
      \context Voice="2" { \voiceOne   \arpeggioAsBarre d''             s
\arpeggioAsBarre d''           }
      \context Voice="3" { \voiceTwo   \arpeggioAsBarre b'            s
\arpeggioAsBarre bes'  \arpeggio }
      \context Voice="4" { \voiceTwo   \arpeggioAsBarre g'  \arpeggio r  g'
}
      \context Voice="5" { \voiceTwo   \arpeggioAsBarre d'  \arpeggio s  d'
} 
      \context Voice="6" { \voiceTwo   \arpeggioAsBarre g   \arpeggio s  s 
}
                        \context Voice="1" { s -"III"   }                       
        
                        \context Voice="6" { s -"hurray!"       }
                        >>
                }
  \layout { \context { \Staff \consists "Span_arpeggio_engraver"} }
        }
        
        
\markup { "combining chords with different durations" }
\context Staff \with { \consists "Span_arpeggio_engraver"}
        { \clef "treble_8" \key c \major 
          \set Staff.connectArpeggios = ##t
                \arpeggioAsBarre
          <<
            { < e' g'> 4 \arpeggio r r 2 }
                        \\
            { < c g~ c'> 2 \arpeggio g }
                        >>
        }
http://www.nabble.com/file/p19542137/arpeggio%2Bas%2Bbarre.png 
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