Quartet Template with/without trills

[Peter Gentry]

I have been trying out the quartet template inserting music with \include. The 
individual instrument music files contain trills and
I have used the tags 'trills and 'expand to produce scores and midi. However 
although the tags work OK when the music files are
compiled individually when using the score file below any music identified by 
'trills or 'expand is skipped. Am I missing a point
here or is this not possible?

\version "2.18.2"

\include "piece.ly"
#(set-global-staff-size 14)
\score {
  \new StaffGroup \keepWithTag #'score 
   \removeWithTag #'expand \music
\layout { }
}
\score {
    \new StaffGroup \keepWithTag #'score 
    \removeWithTag #'trills  \music
   \midi{  }
}  

For the test only one music file conatined the 'trills 'expand tags. Do I need 
to separate the keepWith and removeWith actions with
{} or << >> ?

regards
Peter Gentry