Greetings!

So I've been notating a piece for my son's school band (junior high).
Copying the music from paper into LilyPond using Frescobaldi. And now I hit
a wall. The music piece is written for french horns in E flat pitch. But
the band's horns are in F pitch. I need to transpose the score
appropriately. The band director expects staff with three flats (E flat
major). I hope there's some easier way to do this than me manually
re-writing the score. And I am not even sure how to do that. I would
appreciate any help.

I've played piano, so I can read notes. But these crazy pitched brass
instruments are an intimidating concept... :-/

Below is the initial part of the score for the E flat french horn. Seems
rather big for a small example, but I'd rather have a bit more context.

Thank you!
TJ Kolev :)

======================================================

\version "2.24.0"

trl = \tuplet 3/2 \etc

rpt = #(define-music-function (cnt snip) (integer? ly:music?)
  #{
    { \repeat unfold $cnt $snip }
  #}
)

frhornInIIA = {
  \sectionLabel "Intro"
  \key f \major
  | \trl {a'8( bes a)} g r | \trl {g( a g)} f[ r16 e] | g8 r f[ r16 e] | d8
r r4 \break

  \sectionLabel "Part A"
  \repeat volta 2 {
    | \rpt 4 { r8 <d a'>[ r <d a'>] } \break
    | \rpt 2 { r8 <d bes'>[ r <d bes'>] } | r <d a'>4.:8 | <d a'>2:8^"...."
\break
    | \rpt 4 { r8 <cis a'>[ r <cis a'>] } \break
    | \rpt 2 { r8 <cis a'>[ r <cis a'>] }  | r8 <d a'>4.:8 | <d
a'>2:8^"...." \break
    | \rpt 4 { r8 <d a'>[ r <d a'>] } \break
    | \rpt 2 { r8 <d bes'>[ r <d bes'>] } | r <d a'>4.:8 | <d a'>2:8^"...."
\break
    | \rpt 2 { r8 <d a'>[ r <d a'>] } | r8 <d bes'>[ r <d bes'>] | r8 <d
bes'>4.:8 \break
    | r8 <cis a'>[ r <cis a'>] | r8 <cis a'>[ r <d a'>] | r8 <cis a'>[ r
<cis a'>]
  }
  \alternative {
    { <d a'> r r4 \break }
    { <d a'>8 r <cis a'>4 }
  }
} % A part


frhornIIInIVA = {
  \sectionLabel "Intro"
  \key f \major
  | \trl {a'8( bes a)} g r | \trl {g( a g)} f[ r16 e] | g8 r f[ r16 e] | d8
r r4 \break

  \sectionLabel "Part A"
  \repeat volta 2 {
    | \rpt 4 { r8 <f a,>[ r <f a,>] } \break
    | \rpt 2 { r8 <g bes,>[ r <g bes,>] } | r <f a,>4.:8 | <f a,>2:8^"...."
\break
    | \rpt 4 { r8 <g a,>[ r <g a,>] } \break
    | \rpt 2 { r8 <g a,>[ r <g a,>] }  | r8 <f a,>4.:8 | <f a,>2:8^"...."
\break
    | \rpt 4 { r8 <f a,>[ r <f a,>] } \break
    | \rpt 2 { r8 <g bes,>[ r <g bes,>] } | r <f a,>4.:8 | <f a,>2:8^"...."
\break
    | \rpt 2 { r8 <f a,>[ r <f a,>] } | r8 <g bes,>[ r <g bes,>] | r8 <g
bes,>4.:8 \break
    | r8 <g a,>[ r <g a,>] | r8 <g a,>[ r <f a,>] | r8 <g a,>[ r <g a,>]
  }
  \alternative {
    { <f a,> r r4 \break }
    { <f a,>8 r <g a,>4 }
  }
} % A part


frhornInIINotes = {
  \time 2/4
  \relative c' {
    \frhornInIIA %{
    \frhornInIIB
    \frhornInIIC
    \frhornInIID
    \frhornInIIE
    \frhornInIIF %}
  }
}


frhornIIInIVNotes = {
  \time 2/4
  \relative c' {
    \frhornIIInIVA %{
    \frhornIIInIVB
    \frhornIIInIVC
    \frhornIIInIVD
    \frhornIIInIVE
    \frhornIIInIVF %}
  }
}

sgFrenchHorn = \new StaffGroup <<
  \new Staff \with {
    instrumentName = \markup { \column { \line { French Horn E\flat} \line
{"I & II"} } }
    shortInstrumentName = \markup \teeny { \column { \line {"fhorn"} \line
{"I,II"} } }
  }
  \frhornInIINotes

  \new Staff \with {
    instrumentName = \markup { \column { \line { French Horn E\flat} \line
{"III & IV"} } }
    shortInstrumentName = \markup \teeny { \column { \line {"fhorn"} \line
{"III,IV"} } }
  }
  \frhornIIInIVNotes
>>

\score {
  \sgFrenchHorn
}

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