Template for multiple instruments, prints a score and parts

This template is designed for a horn section, by default seven horns. It will print a full score and individual parts for the horns. It includes some overrides - beaming, glissando style, multi-measure rest and numeric time signature. There are also, commented out, overrides for bar numbering. The \paper section is defined for maximum staves per page. And there is a script for adding the current date to the default tagline. This template can be easily modified for more or fewer instruments, or can be used for vocal music as well.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=603

\include "english.ly"

\header {
  title = "Song Title"
  composer = "As Recorded By: "
  arranger = "Transcribed by: "
}

global = {
  \key c \major
  \time 4/4
  \set Timing.beamExceptions =      
  	#'(                    
  	   (end .              
  	    (                  
  	     ((1 . 8) . (2 2 2 2))   
  	    ))) 
  %\override Score.BarNumber.break-visibility = #'#(#t #t #t)
  %\override Score.BarNumber.break-visibility = #end-of-line-invisible
  %\override Score.BarNumber.self-alignment-X = #LEFT
  \override Glissando.thickness = #3
  \override Glissando.style = #'zigzag
  \override Glissando.minimum-length = #6
  \override Glissando.springs-and-rods = #ly:spanner::set-spacing-rods
  \override MultiMeasureRest.expand-limit = #1
  \set Score.skipBars = ##t
  \numericTimeSignature
}
%%%%% This setup should give me the maximum usable staves per page %%%%%
\paper {
  top-margin = 0.1\cm 
  top-system-spacing.basic-distance = #0
  ragged-bottom = ##t
  left-margin = 20\mm
  line-width = 175\mm
}

%%%%% This script sets the 'footer' of the last page to show the current date %%%%%
tagline = \markup {
  #(strftime "%b %d, %Y" (localtime (current-time)))
  \with-url "http://lilypond.org/web/"
  { LilyPond #(lilypond-version) (http://lilypond.org/) }
}

% ------ Trumpet 1------
trpta = {
  a b c d 
}
trumpeta = %{\transpose c d%} \relative c'' {
  \global
  \set Staff.instrumentName = #"Trumpet 1"
  \set Staff.shortInstrumentName = #"Trpt 1"
  \clef treble
  << \trpta >>
}

% ------ Trumpet 2------
trptb = {
  a4 b c d
}
trumpetb = %{\transpose c d%} \relative c'' {
  \global
  \set Staff.instrumentName = #"Trumpet 2"
  \set Staff.shortInstrumentName = #"Trpt 2"
  \clef treble
  << \trptb >>
}

% ------ Alto Sax 1 ------
altoa = {
  a4 b c d
}
altosaxa = %{\transpose c a%} \relative c'' {
  \global
  \set Staff.instrumentName = #"Alto Sax"
  \set Staff.shortInstrumentName = #"Alto"
  \clef treble
  << \altoa >>
}

% ------ Tenor------
tenor = {
  a4 b c d
}
tenorsax = %{\transpose c d%} \relative c'' {
  \global
  \set Staff.instrumentName = #"Tenor Sax"
  \set Staff.shortInstrumentName = #"Tenor"
  \clef treble
  << \tenor >>
}

% ------ Bari------
bari = {
  a4 b c d
}
barisax = %{\transpose c a%} \relative c'' {
  \global
  \set Staff.instrumentName = #"Bari Sax"
  \set Staff.shortInstrumentName = #"Bari"
  \clef treble
  << \bari >>
}

% ------ Trombone 1------
tbonea = {
  a4 b c d
}
trombonea = \relative c {
  \global
  \set Staff.instrumentName = #"Trombone"
  \set Staff.shortInstrumentName = #"Tbn"
  \clef bass
  << \tbonea >>
}

% ------ Bass Trombone------
tboneb= {
  a4 b c d
}
tromboneb = \relative c {
  \global
  \set Staff.instrumentName = #"Bass Trombone"
  \set Staff.shortInstrumentName = #"Bass Tbn"
  \clef bass
  << \tboneb >>
}
%%%%% This section creates the separate pdf files for each horn %%%%%
\book {
  \score {
    <<
      \new StaffGroup = "trumpets" <<
        \new Staff = "trpta" \trumpeta
        \new Staff = "trptb" \trumpetb
       >>
      \new StaffGroup = "saxes" <<
        \new Staff = "altoa" \altosaxa
        \new Staff = "tenor" \tenorsax
        \new Staff = "bari" \barisax
      >>
      \new StaffGroup = "trombones" <<
        \new Staff = "tbonea" \trombonea
        \new Staff = "tboneb" \tromboneb
      >>
    >>
  }
}
%{
%%%%% comment all these \book lines if no score is needed %%%%%%
\book { \score { << \new Staff = "trumpeta" \with { \remove Instrument_name_engraver } \trumpeta >> \header { piece = "Trumpet 1" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "trumpetb" \with { \remove Instrument_name_engraver } \trumpetb >> \header { piece = "Trumpet 2" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "altosaxa" \with { \remove Instrument_name_engraver } \altosaxa >> \header { piece = "Alto Sax" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "tenorsax" \with { \remove Instrument_name_engraver } \tenorsax >> \header { piece = "Tenor Sax" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "barisax" \with { \remove Instrument_name_engraver } \barisax >> \header { piece = "Baritone Sax" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "trombonea" \with { \remove Instrument_name_engraver } \trombonea >> \header { piece = "Trombone" } \layout { indent = 0\mm } } }
\book { \score { << \new Staff = "tromboneb" \with { \remove Instrument_name_engraver } \tromboneb >> \header { piece = "Bass Trombone" } \layout { indent = 0\mm } } }
%}
\layout {
  \context {
    \Score
  }
}