newbie question: lilypond squeezes everything on 1 staff

[Ron Arts]

Well,

I did it, I tried lilypond. And it looks great so far,
and apart from having trouble with english
terminology, I can't seem to get lilypond
create more then one staff. If I add more notes, they
are just squeezed onto the same staff.

Here's my code. Suggestions much appreciated,

thanks,
Ron Arts


\version "1.6.0"
upper =  \context Staff \notes\relative c'{
        r1
        r
        r
        r
        r
        r
        r
         e4 r8 fis g4 r8 ees
}

lower =  \context Staff \notes\relative c,{
        r2            r8      < cis8( gis' > < d a' > < )dis ais' >
        < e1 b' > ~
        < e2 b' > ~ < e8 b' > < cis8 gis' > < d a' > < dis ais' >
        < e1 b' > ~
        < e2 b' > ~ < e8 b' > < dis8 ais' > < d a' > < cis gis' >
        < c1 g' > ~
        < c2 g' > ~ < c8 g' > < cis8 gis' > < d a' > < dis ais' >
        r1
}

global =  \notes{
        \time 4/4
}
\score{
        \context GrandStaff <
        \context Staff = upper <
                \global
                \upper
        >
        \context Staff = lower <
                \global
                \clef "bass"
                \lower
        >
>
\paper{
          linewidth = 18.0 \cm
        }
}

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