a @code{ChoirStaff} group. Accompaniment, if required, is placed
beneath in a @code{PianoStaff} group, which is usually reduced in
size for @emph{a capella} choral works. The notes for each vocal
-part are placed in a @code{Voice} context, with each either on a
-staff of its own or grouped in pairs on a single staff.
+part are placed in a @code{Voice} context, with each staff
+being given either a single vocal part (i.e., one @code{Voice}) or
+a pair of vocal parts (i.e., two @code{Voice}s).
Words are placed in @code{Lyrics} contexts, either underneath each
corresponding music staff, or one above and one below the music
Shape noteheads, as used in Sacred Harp and similar notation, are
described in @ref{Shape note heads}.
+@item
+When two vocal parts share a staff the stems, ties, slurs, etc., of
+the higher part will be directed up and those of the lower part
+down. To do this, use @code{\voiceOne} and @code{\voiceTwo}. See
+@ref{Single-staff polyphony}.
+
@end itemize
+@predefined
+@code{\voiceOne},
+@code{\voiceTwo}.
+
@seealso
Learning Manual:
@rlearning{Four-part SATB vocal score},
@rlearning{Vocal ensembles}.
Notation Reference:
-@ref{Grouping staves},
@ref{Context layout order},
-@ref{Shape note heads}.
+@ref{Grouping staves},
+@ref{Shape note heads},
+@ref{Single-staff polyphony}.
Internals Reference:
@rinternals{ChoirStaff},