Page breaks in 2.4 using \book

[Walter Hofmeister]

Hello,
    I'm enjoying version 2.4 on Mac OS X. I am making some variations of an
exercise and would like to spread it out over two pages. I am not quite
happy with how it comes out and would like to insert a page break. Nothing I
seem to do has the desired effect. Reading the manual leads me to believe
that I need to place a \pageBreak command in the note data. Does this change
when one is using several \score sections within a \book block? If so where
should the command go? My file looks like this:

\version "2.4.0"
\include "english.ly"
#(set-default-paper-size "letter")

\book {
\header {
    title = "Title"
}

%************************* THEME ******************************

\score {
   \header {
   piece = "Theme"
   }
   \new Staff <<
           \context Voice = one {
        \relative c'' {
   \clef treble
   \key c \major
   \time 4/4
   \stemUp

   some notes...
   \bar "|."
}

    }
    
    \context Voice = two {
    \relative c' {
    \key c \major
    \time 4/4
    \stemDown
    
    some notes...
    }
}
    >>
    }


%***************************** VARIATION 1 *********************************

\score {
   \header {
   piece = "Variation 1"
   }
   \new Staff <<
           \context Voice = one {
        \relative c'' {
    \clef treble
   \key c \major
   \time 4/4
   \stemUp
   
   some notes...
   \bar "|."
    }
}
        \context Voice = two {
    \relative c' {
    \key c \major
    \time 4/4
    \stemDown
    
    some notes...
    }
}
    >>
   %\layout { }
   %\midi { }
    }


%******************************** VARIATION 2 ***************************

\score {
    \header {
    piece = "Variation 2"
    }
    
    \new Staff <<
        \context Voice = one {
        \relative c'' {
            \key c \major
            \time 4/4
            \stemUp
            
            some notes...
            \bar "|."
            }
        }
        
        \context Voice = two {
        \relative c' {
            \key c \major
            \time 4/4
            \stemDown
            
            some notes...
            \bar "|."    \pageBreak
            }
        }
    >>
    }

\pageBreak <<-------------here is where I would like the page break.

%******************************* VARIATION 3 ******************************

\score {
    \header {
    piece = "Variation 3"
    }
    
    \new Staff <<
        \context Voice = one {
            \relative c'' {
            \key c \major
            \time 4/4
            \stemUp
            
            some notes...
            \bar "|."
            }
        }
        
        \context Voice = two {
            \relative c' {
            \key c \major
            \time 4/4
            \stemDown
            
            some notes...
            }
        }
    >>
    }

%***************************** VARIATION 4 ****************************

\score {
    \header {
    piece = "Variation 4"
    }
    
    \new Staff <<
        \context Voice = one {
            \relative c'' {
            \key c \major
            \time 4/4
            \stemUp
            
            some notes...
            \bar "|."
            }
        }
        
        \context Voice = two {
            \relative c' {
            \key c \major
            \time 4/4
            \stemDown
            
            some notes...
            }
        }
    >>
    }
} 



Thanks for your help.

Walter Hofmeister