Nested StaffGroups

[Aaron Dalton]

I am running Lilypond 2.2.5 via cygwin on an XP box.  I have access to 
2.2.3 on my FreeBSD box but I get the same results.

I am trying to duplicate a section of a Baroque opera score.  I is a 
single system with 5 staves.  The top 3 are Violin1, Violin2, and Viola. 
  This is followed by a staff for the voice and a staff for the 
continuo.  All 5 staves should be connected at the beginning with a 
single line.  The top three staves should be braced, and the the top *2* 
staves should be further grouped with a bracket.  I have included my 
current .ly file for examination.  I believe I have correctly followed 
the example in section 3.3.8 of the documentation.  When I compile this 
document, I get all 5 staves grouped together with a single brace and 
all the barlines shared.

On a side note, I am very new to Lilypond syntax in general.  There 
*has* to be a way to declare time and key signature for all staves in 
one place.  If I put it after the \score delcaration I get a syntax 
error and if I put it after the \notes declaration it only affects the 
first staff.

I *greatly* appreciate any help you can offer.

Cheers!
Aaron

-----

\score {
        \notes {
                \context StaffGroup << % groups all 5 staves
                        \context StaffGroup << % groups the top 3 staves
                                \context StaffGroup << % further groups the top 
2 staves
                                        \new Staff {
                                                \clef treble
                                                \time 4/4
                                                \key a \major
                                                {s1 | s1}
                                        }
                                        \new Staff {
                                                \clef treble
                                                \time 4/4
                                                \key a \major
                                                {s1 | s1}
                                        }
                                >> % end top 2 staves
                                \new Staff {
                                        \clef alto
                                        \time 4/4
                                        \key a \major
                                        {s1 | s1}
                                }
                        >> % end top 3 staves
                        \new Staff {
                                \clef treble
                                \time 4/4
                                \key a \major
                                {s1 | s1}
                        } % new staff ungrouped as per documentation section 
3.3.8
                        \context StaffGroup <<
                                \new Staff {
                                        \clef bass
                                        \time 4/4
                                        \key a \major
                                        {s1 | s1}
                                }
                        >> % end continuo
                >> % end 5-staff group
        }
}