Tagging Troubles

[mojocojo2000]

I'm trying to create a grand staff around two oboe parts when score.ly is
compiled.  The files I'm using are belowed.

% piece.ly

music = {
% oboe I.II
\tag #'woodwinds \new GrandStaff <<
\tag #'woodwinds \tag #'ob12 \new Staff { 
\tag #'woodwinds \tag #'ob12 \set Staff.midiInstrument = "oboe"
\tag #'woodwinds \set Staff.instrumentName = "Oboe I.II"
\tag #'woodwinds \set Staff.shortInstrumentName = "Ob.I.II"
\tag #'woodwinds \tag #'ob12 << \global \partcombine \oboeOne \oboeTwo >> }
% oboe III.IV
\tag #'woodwinds \tag #'ob34 \new Staff { 
\tag #'woodwinds \tag #'ob34 \set Staff.midiInstrument = "oboe"
\tag #'woodwinds \set Staff.instrumentName = "Oboe III.IV"
\tag #'woodwinds \set Staff.shortInstrumentName = "Ob.III.IV"
\tag #'woodwinds \tag #'ob34 << \global \partcombine \oboeThree \oboeFour >>
} 
\tag #'woodwinds >>
}


% ob12.ly
\version "2.10.0"
\include "piece.ly"
\header {
        instrument = "Oboe I.II"
}
\score {
  \keepWithTag #'ob12 \music
  \layout { }
  \midi { }
}


% score.ly
\version "2.10.0"
\include "piece.ly"
#(set-global-staff-size 14)
\score {
                \new StaffGroup \keepWithTag #'woodwinds \music
                \new StaffGroup \keepWithTag #'brass \music
                \new StaffGroup \keepWithTag #'percussion \music
                \new StaffGroup \keepWithTag #'strings \music
                \layout { }
                \midi { }
}


The problem is when I compile score.ly I get an error about unexpected >>. 
This of course comes from the line -- \tag #'woodwinds >>  in piece.ly.  Is
there anyway to make this work?


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