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Using polyphony under parallel Music


From: Alberto Simões
Subject: Using polyphony under parallel Music
Date: Thu, 01 Jan 2009 19:45:20 +0000
User-agent: Thunderbird 2.0.0.19 (Macintosh/20081209)

Hello

I am trying to use \parallelMusic with some success.
My only problem is that at a specific point in the music, the composer
decided to add a new temporary voice.

I was trying to use something like:

\parallelMusic #'(upperA upperB) {
        % line 1 - 1
        \partial 4 b4\(  |
        \partial 4 b4~   |
        % line 1 - 2
        e4. b8 gis'4 e   |
        b1               |

[...]

        gis2 ~ gis8\) cis,8\( dis[ e] |
        cis2 ~ cis8 cis b4            |
        % line 2 - 4
        a4. a8 gis4 fis                |
        << { e2 ~ e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
        % line 3 - 1
        \partial 8*5 e2 ~ e8 \fermata\) |
        \partial 8*5 b2 ~ b8            |
}

The problem here is that << {} \\ {} >> part.
Lilypond is complaining and rendering some strange things.
The error messages:

piano+voz.ly:62:13: warning: adding note head to incompatible stem (type
= 4)
        << {
             e2 ~ e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:62:13: warning: maybe input should specify polyphonic voices
        << {
             e2 ~ e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
[8]
piano+voz.ly:62:18: warning: adding note head to incompatible stem (type
= 4)
        << { e2 ~
                  e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:62:18: warning: maybe input should specify polyphonic voices
        << { e2 ~
                  e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:61:15: warning: stem does not fit in beam
        a4. a8
               gis4 fis                                       |
piano+voz.ly:62:20: warning: beam was started here
        << { e2 ~ e8
                    [ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:62:27: warning: adding note head to incompatible stem (type
= 4)
        << { e2 ~ e8[ dis]
                           cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:62:27: warning: maybe input should specify polyphonic voices
        << { e2 ~ e8[ dis]
                           cis[ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:61:20: warning: stem does not fit in beam
        a4. a8 gis4
                    fis                                       |
piano+voz.ly:62:30: warning: beam was started here
        << { e2 ~ e8[ dis] cis
                              [ dis] } \\ { cis8[ b] cis4 s2 }>>  |
piano+voz.ly:61:62: warning: barcheck failed at: -5/8
        a4. a8 gis4 fis
                                                              |
piano+voz.ly:62:66: warning: barcheck failed at: -5/8
        << { e2 ~ e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>
                                                                  |
Preprocessing graphical objects...
Interpreting music...
piano+voz.ly:61:62: warning: barcheck failed at: -5/8
        a4. a8 gis4 fis
                                                              |
piano+voz.ly:62:66: warning: barcheck failed at: -5/8
        << { e2 ~ e8[ dis] cis[ dis] } \\ { cis8[ b] cis4 s2 }>>
                                                                  |

Thanks for any hint.
Alberto

-- 
Alberto Simões - Departamento de Informática - Universidade do Minho
                 Campus de Gualtar - 4710-057 Braga - Portugal




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