First simple definitions plus template.ly

template.ly

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+\version "2.19.80"
+
+\include "tinwhistle.ily"
+
+\header {
+  title = "Title"
+  tagline = ##f
+  meter = "Meter"
+  enteredby = "kastdeur"
+  number = ""
+  source = ""
+}
+
+global = {
+  \key g \major
+  \time 4/4
+}
+
+
+fluteA = \relative c'' {
+  \repeat unfold 2 {
+    d8. c16 |
+    b8. g16 d8. g16	b8. g16 d8. g16 |
+    \tuplet 3/2 { g'8 a g } fis8. g16	e4 \breathe
+  } \alternative {
+      {
+        d8. c16 |
+        b8. g16 d8. g16	b8. g16 d8. g16 |
+        d'8. c16 b8. c16	a4 \breathe
+      }
+      {
+         d8. c16 |
+         b8. g'16 fis8. g16 e8. c16 a8. fis16 |
+         g4 b4 g4 \breathe
+      }
+  }
+
+
+}
+fluteB = \relative c'' {
+  g'=''8. a16 |
+  b8. a16 g8. fis16	e8. fis16 g8. a16 |
+  b8. a16 g8. fis16 e4 \breathe	fis8. g16 |
+  a8. g16 fis8. e16	d8. e16 fis8. g16 |
+  a8. g16 fis8. e16 d4 \breathe
+
+  e8. fis16 |
+  g4.\lroll d8	\tuplet 3/2 { e8 fis g } d8. b16 |
+  c8. b16 a8. b16	c8. d16 e8. fis16 |
+  g4.\lroll d8	e8. c16 a8. fis16 |
+  g4 b4 g4 \breathe
+
+}
+
+flute = \relative c'' {
+  \global
+  \repeat volta 2 {\partial 4 \fluteA \tag #'midiRemove s4}
+  \break
+  \repeat volta 2 {\partial 4 \fluteB \tag #'midiRemove s4}
+}
+chordA = \chordmode {
+  g4 |
+  g1 | c1 | g1 | d1 |
+  g1| e2:m c2 | g2 d2 | g2.
+}
+chordB = \chordmode {
+  g4 |
+  e1:m | e1:m | a2:m d2 | a2:m d2 |
+  g2 e2:m | a2:m c2 | g2 d2 | g2.
+}
+chordNames = \chordmode {
+  \global
+  % Akkoordnamen volgen.
+  \repeat volta 2 {\partial 4 \chordA \tag #'midiRemove s4 }
+  \repeat volta 2 {\partial 4 \chordB \tag #'midiRemove s4 }
+}
+
+chordsPart = \new ChordNames \with {
+  chordChanges = ##t
+} \chordNames
+
+flutePart = \new Staff \with {
+  instrumentName = "Fl."
+  midiInstrument = "flute"
+} \flute
+
+\score {
+  <<
+    \chordsPart
+    \flutePart
+  >>
+  \layout { }
+}
+\score {
+  \unfoldRepeats \removeWithTag #'midiRemove <<
+    \chordsPart
+    \flutePart
+  >>
+  \midi {
+    \tempo 4=100
+  }
+}

tinwhistle.ily

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+%{
+  Standard definitions for tinwhistle
+%}
+
+\version "2.19.82"
+
+lroll = _\turn % long roll (d cd ed)
+sroll = _\prall % short roll (cd ed)