Newbie having trouble with transposition(s)

[Patrick Smith]

Another first-time LilyPond poster/user here!

I've been using LilyPond for about a week now and I'm really loving it
already.

I'm a brass player who is using LilyPond to create beautiful engravings for
brass ensembles. I'm also an engineer who wishes he was better at
programming and LilyPond.

Anyway, I'm starting by transcribing/arranging string quartets for the
standard brass quartet (2 trumpets in B flat, 1 horn in F and 1 trombone in
C). The string parts are all non-transposing instruments.

Because I plan to do a lot of these, I'd like to get my templates *perfect*
before moving past the first one. So far, I've managed to create a *single*
input files that does everything (produces all the PDFs ... score and
parts).

I've got most of the basics working however I'm having trouble with the
transpositions. They aren't working as I expected. I thought the
transposition function would take care of putting the parts into the right
key. But, all of the parts have a key signature of d minor (one flat) (no
key signature transposition is happening).

Please help me if you can.

Thanks in advance,
Patrick

Here is my minimalist Tiny code.

\version "2.18.2"
\header { ... }

% Global definitions
global = {
  \time 2/2
  \key d \minor
  s1*78
  \bar "|."
}

%*********************************
TrumpetOne = \new Voice {
  \set Staff.instrumentName = #"Trumpet I in Bb"
  \clef treble
  \transpose bes c' {
    \relative c'' {
...
    }
  }
}

%*********************************
TrumpetTwo = \new Voice {
  \set Staff.instrumentName = #"Trumpet II in Bb"
  \clef treble
  \transpose bes c' {
    \relative c' {
...
    }
  }
}

%*********************************
Horn = \new Voice {
  \set Staff.instrumentName = #"Horn in F"
  \clef treble
  \transpose f c' {
    \relative c' {
...
    }
  }
}

%*********************************
Trombone = \new Voice {
  \set Staff.instrumentName = #"Trombone"
  \clef bass
    \relative c {
...
    }
  }
}

%**********************************
music = {
  <<
    \tag #'score \tag #'trpI  \new Staff { << \global \TrumpetOne >> }
    \tag #'score \tag #'trpII \new Staff { << \global \TrumpetTwo>> }
    \tag #'score \tag #'horn  \new Staff { << \global \Horn>> }
    \tag #'score \tag #'trbn  \new Staff { << \global \Trombone>> }
  >>
}

%**********************************
% Print the score and create a midi file
\book {
  \bookOutputSuffix "Score"
  #(set-global-staff-size 14)
  \score {
    \header { piece = "Score" }
\bookOutputSuffix "Score"
    \new StaffGroup \keepWithTag #'score \music
    \layout { }
    \midi { }
  }
}

%*********************************
% Print the TrumpetOne part
\book {
  \bookOutputSuffix "TrumpetOne"
  \score {
    \header { piece = "Trumpet I" }
    \keepWithTag #'trpI \music
    \layout { }
  }
}

etc.

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