combining little complete pieces in one "book"?

[Ole Schmidt]

Dear list,

Is it possible to create one file/pdf out of many little files who  
look like below with the
 \include command? (Having all the titles included...)
using the\book { } command...?
I can produce only lots of error warnings...

thanks for a hint

ole

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\header {
        title = "bla"
}

staffClarinet = \new Staff  {
blablabla       
        }
staffTrumpet = \new Staff  {
blablabla
        }
\score {
        <<
        \staffTrumpet
        \staffClarinet
        >>
\layout  {
                \context { \Score
        \remove "Bar_number_engraver" }
        }
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%