+@cindex verse and refrain
+
+We end with an example to show how we might code a solo verse which
+continues into a two-part refrain in two staves. The
+positioning of the sequential and simultaneous sections to achieve
+this within a single score is quite tricky, so follow the
+explanation carefully!
+
+Let's start with a score block containing a @code{ChoirStaff}, as
+we would like the brace to appear at the start of the chorus.
+Normally you would need angle brackets after @code{\new ChoirStaff}
+to bring in all the staves in parallel, but here we want to
+defer the parallelism during the solo so we use braces, although
+angle brackets here wouldn't hurt. Inside the @code{ChoirStaff} we
+want first the staff which will contain the verse. This must
+contain notes and lyrics in parallel, so here we need angle
+brackets around the @code{\new Voice} and @code{\new Lyrics} to
+start them at the same time:
+
+@lilypond[quote,verbatim,ragged-right]
+versenotes = \relative c'' {
+ \clef "treble"
+ \key g \major
+ \time 3/4 g g g b b b
+}
+versewords = \lyricmode {
+ One two three four five six
+}
+\score {
+ \new Choirstaff {
+ \new Staff <<
+ \new Voice = "verse" {
+ \versenotes \break
+ }
+ \new Lyrics \lyricsto verse {
+ \versewords
+ }
+ >>
+ }
+}
+@end lilypond
+
+That gives the verse line.
+
+Now we want to continue with refrainA on the same staff while a
+second staff is introduced in parallel with it for refrainB, so
+this is a parallel section which must be positioned immediately
+following the @code{\break} in the verse Voice. Yes, @emph{within}
+the verse Voice! Here's that parallel section. More staves
+could be introduced here in the same way.
+
+@example
+<<
+ \refrainnotesA
+ \new Lyrics \lyricsto verse @{
+ \refrainwordsA
+ @}
+ \new Staff <<
+ \new Voice = "refrainB" @{
+ \refrainnotesB
+ @}
+ \new Lyrics \lyricsto "refrainB" @{
+ \refrainwordsB
+ @}
+ >>
+>>
+@end example
+
+Here's the final result with two staves in the chorus showing
+how the parallel section is positioned within the verse Voice:
+
+@lilypond[quote,verbatim, ragged-right]
+versenotes = \relative c'' {
+ \clef "treble"
+ \key g \major
+ \time 3/4 g g g b b b
+}
+refrainnotesA = \relative c'' {
+ \time 2/4
+ c c g g \bar "|."
+}
+refrainnotesB = \relative c {
+ \clef "bass"
+ \key g \major
+ c e d d
+}
+versewords = \lyricmode {
+ One two three four five six
+}
+refrainwordsA = \lyricmode {
+ la la la la
+}
+refrainwordsB = \lyricmode {
+ dum dum dum dum
+}
+\score {
+ \new ChoirStaff {
+ \new Staff <<
+ \new Voice = "verse" {
+ \versenotes \break
+ <<
+ \refrainnotesA
+ \new Lyrics \lyricsto "verse" {
+ \refrainwordsA
+ }
+ \new Staff <<
+ \new Voice = "refrainB" {
+ \refrainnotesB
+ }
+ \new Lyrics \lyricsto "refrainB" {
+ \refrainwordsB
+ }
+ >>
+ >>
+ }
+ \new Lyrics \lyricsto "verse" {
+ \versewords
+ }
+ >>
+ }
+}
+@end lilypond
+
+@cindex book, example of using
+@funindex \book
+
+However, although this is an interesting and useful exercise to
+help you to understand how sequential and simultaneous blocks work,
+in practice one would perhaps choose to code this as two
+@code{\score} blocks within an implicit @code{\book} block, as
+follows:
+
+@lilypond[quote,verbatim,ragged-right]
+versenotes = \relative c'' {
+ \clef "treble"
+ \key g \major
+ \time 3/4 g g g b b b
+}
+refrainnotesA = \relative c'' {
+ \time 2/4
+ c c g g \bar "|."
+}
+refrainnotesB = \relative c {
+ \clef "bass"
+ \key g \major
+ c e d d
+}
+versewords = \lyricmode {
+ One two three four five six
+}
+refrainwordsA = \lyricmode {
+ la la la la
+}
+refrainwordsB = \lyricmode {
+ dum dum dum dum
+}
+\score {
+ \new Staff <<
+ \new Voice = "verse" {
+ \versenotes
+ }
+ \new Lyrics \lyricsto "verse" {
+ \versewords
+ }
+ >>
+}
+
+\score {
+ \new ChoirStaff <<
+ \new Staff <<
+ \new Voice = "refrainA" {
+ \refrainnotesA
+ }
+ \new Lyrics \lyricsto "refrainA" {
+ \refrainwordsA
+ }
+ >>
+ \new Staff <<
+ \new Voice = "refrainB" {
+ \refrainnotesB
+ }
+ \new Lyrics \lyricsto "refrainB" {
+ \refrainwordsB
+ }
+ >>
+ >>
+}
+@end lilypond
+