#### Upbeats

Partial or pickup measures, such as an anacrusis or an upbeat, are entered using the \partial command:

\partial duration


When \partial is used at the beginning of a score, duration is the length of the music preceding the first bar.

\relative {
\time 3/4
\partial 4.
r4 e'8 | a4 c8 b c4 |
}


When \partial is used after the beginning of a score, duration is the remaining length of the current measure. It does not create a new numbered bar.

\relative {
\set Score.barNumberVisibility = #all-bar-numbers-visible
\override Score.BarNumber.break-visibility =
#end-of-line-invisible
\time 9/8
d''4.~ 4 d8 d( c) b | c4.~ 4. \bar "||"
\time 12/8
\partial 4.
c8( d) e | f2.~ 4 f8 a,( c) f |
}


The \partial command is required when the time signature changes in mid measure, but it may also be used alone.

\relative {
\set Score.barNumberVisibility = #all-bar-numbers-visible
\override Score.BarNumber.break-visibility =
#end-of-line-invisible
\time 6/8
\partial 8
e'8 | a4 c8 b[ c b] |
\partial 4
r8 e,8 | a4 \bar "||"
\partial 4
r8 e8 | a4
c8 b[ c b] |
}


The \partial command sets the Timing.measurePosition property, which is a rational number that indicates how much of the measure has passed.

For technical reasons, the argument to \partial cannot be a zero-length duration (like \partial 4*0).