\chapter{Staff Size} \index{staff size}\label{staffspacing}
In contrast with the prior section, here we describe how to change the sizes
of everything...staff, notes, and all other symbols. In
Section~\ref{whatspecify} we saw how to set the size for all instruments at
the start of a score. Any one of the same macros---\verb|\normalmusicsize|,
\verb|\smallmusicsize|, \verb|\largemusicsize|, or
\verb|\Largemusicsize|---can be used to change the size of all instruments
midway through a score, but in this case it must come between
\verb|\stoppiece| and \verb|\startpiece|.
Once the overall staff size is set, you can alter the size of any desired
instrument with the macro \keyindex{setsize}\itbrace{n}\itbrace{s}, where
$n$ is the instrument number and $s$ is a factor by which the size is to be
changed from the prevailing overall size. There are five predefined macros
that should be used for the size factor $s$. Their names and respective values
are \keyindex{normalvalue}~($1.0$), \keyindex{smallvalue}~($0.80$),
\keyindex{tinyvalue}~($0.64$), \keyindex{largevalue}~($1.2$), and
\keyindex{Largevalue}~($1.44$). \musixtex\ should not crash if you use an
explicit number different from any of these, but the result may be
less than satisfactory.
Once again, if used at the beginning of a piece, the \verb|\setsize| macro
must precede \verb|\startpiece| (not \verb|\contpiece|), and if used after
the beginning, must be preceded by \verb|\stoppiece|.
As an example, we give two bars of the \ital{Ave Maria} by Charles {\sc
Gounod}\index{Gounod, C.@{\sc Gounod, C.}}, based on the first prelude of
J. S. Bach's \ital{Well Tempered Clavier}, as transcribed for
organ, violin and voice by Markus {\sc Veittes}:\label{avemaria}
