pageBreaking in a \book section - system spacing problems

[Marian]

I want to begin a new page for the second system, now the layout in the page (
which is "before" the pageBreak ) looks very strange.

\book
{       \score 
        {<<     \context Voice = "mel"
                {       \clef treble
                        a4 a a a \break
                        g g g g\pageBreak}>>}
        \score
        {       <<      \context Voice = "mel"
                        {       \clef bass
                                f4 f f f\break
                                e e e e}>>}
}

Hope I could help, you're doing great work, Thanks,

Marian