Automatic part combining is used to merge two parts of music onto a staff. It is aimed at typesetting orchestral scores. When the two parts are identical for a period of time, only one is shown. In places where the two parts differ, they are typeset as separate voices, and stem directions are set automatically. Also, solo and a due parts are identified and can be marked.
The syntax for part combining is
\partcombine musicexpr1 musicexpr2
The music expressions will be interpreted as Voice
contexts. If using relative octaves, \relative
should be
specified for both music expressions, i.e.
\partcombine \relative ... musicexpr1 \relative ... musicexpr2
A \relative
section that is outside of \partcombine
has
no effect on the pitches of musicexpr1 and musicexpr2.
The following example demonstrates the basic functionality of the part combiner: putting parts on one staff, and setting stem directions and polyphony
\new Staff \partcombine \relative g' { g g a( b) c c r r } \relative g' { g g r4 r e e g g }
The first g
appears only once, although it was
specified twice (once in each part). Stem, slur and tie directions are
set automatically, depending whether there is a solo or unisono. The
first part (with context called one
) always gets up stems, and
`solo', while the second (called two
) always gets down stems and
`Solo II'.
If you just want the merging parts, and not the textual markings, you
may set the property soloADue
to false
\new Staff << \set Staff.soloADue = ##f \partcombine \relative g' { g a( b) r } \relative g' { g r4 r f } >>
Program reference: PartCombineMusic, SoloOneEvent, and SoloTwoEvent, and UnisonoEvent.
In soloADue
mode, when the two voices play the same notes on and
off, the part combiner may typeset a2
more than once in a
measure.
\partcombine
cannot be inside \times
.
\partcombine
cannot be inside \relative
.
Internally, the \partcombine
interprets both arguments as
Voice
s named one
and two
, and then decides when
the parts can be combined. Consequently, if the arguments switch to
differently named Voice contexts, the events in those
will be ignored.
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