I often use LilyPond 2.18.2 to make jazz/pop charts which will
need to be transposed for non-concert instruments. This can
sometimes lead to non-optimal enharmonic choices of melodic notes
or chord roots in the transposed book part(s).
I work around this by employing tags around the problematic
note(s), such as when I have a concert B, but wish to have the
trumpet part show a D-flat, not a C-sharp:
foo = \new Staff \relative c' {
<<
\tag #'concert { b1 }
\tag #'trumpet { ces1 }
>>
}
\score {
\transpose c d \keepWithTag #'trumpet \foo
}
This is not a perfect example, but I hope it illustrates my point.
I use simulataneous music around the tags so that the length of music
in variable foo is accurate, and I can use many of the handy extractMusic
functions (extractBegin, extractEnd, etc.) that I picked up from someone
on this list whose name escapes me right now.
[ "Thank you" to http://gillesth.free.fr/Lilypond/extractMusic/extractMusic.ly ]
This works great. But I often have the same problem in chordmode
music, "the same problem" meaning that I need to use tagged
alternative bits of enharmonic music where the tagged
alternatives are simultaneous so that they don't artificially
lengthen the number of beats/bars of music. Unfortunately,
simultaneous music << >> doesn't work in \chordmode:
foo = \new Staff \relative c' {
<<
\tag #'concert { b1 }
\tag #'trumpet { ces1 }
>>
}
fooChords = \new ChordNames \chordmode {
<<
\tag #'concert { b1 }
\tag #'trumpet { ces1 }
>>
}
\score {
\transpose c d
\keepWithTag #'trumpet
<<
\fooChords
\foo
>>
}
Lily complains with:
x.ly:9:3: error: syntax error, unexpected $undefined
Is there a technical reason why simultaneous music hasn't been
implemented in \chordmode music? How might I work around this,
so that usage of \tag within \chordmode doesn't distort the true
length of the music stored in a variable?
For passages of repeated chords with only slight changes at the
end, I often write things like:
foo = \chordmode { a1 b1 c1 c1 }
bar = \chordmode {
\extractBegin
\repeat unfold 2 \foo
s1*7 % extract the first 7 of those 8 bars
a1
}
to create a variable bar that yields:
a1 b1 c1 c1
a1 b1 c1 a1
But of course, that breaks down if \foo contains tagged music that isn't
simultaneous with the \tag alternatives. That is, I need the lengths of:
\foo
\keepWithTag #'concert \foo
\keepWithTag #'trumpet \foo
\keepWithTag #'altosax \foo
to all be equal.
I hope I've explained this well, I'm not so sure right now! :) If someone
feels like they could help if they had a clearer example, I'll try to cobble
one up.
Thank you!
Jim
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