Partial measures (pickup measures)
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Partial measures, such as an anacrusis or upbeat, are entered using the \partial command. The syntax for this command is \partial duration.
This is internally translated into \set Timing.measurePosition = -length of duration
The property measurePosition contains a rational number indicating how much of the measure has passed at this point.
\version "2.24.0"
%% http://lsr.di.unimi.it/LSR/Item?id=183
%LSR modified/updated by P.P.Schneider on April 2014.
%=> http://lilypond.1069038.n5.nabble.com/LSR-correction-Partial-measures-pickup-measures-td161387.html
\paper { tagline = ##f }
%here starts the snippet:
\relative c''{
\partial 16*5 c16 cis d dis e | a2. c,4 | b1
}
% Below are the instruction to set the pickup bar with the grace note.
\relative c'' {
\partial 4
\grace f16
g4
a2 g2
}