\version "2.12.3"

% Accordion piece template. To create an accordion piece from this,
% save it as e.g. MyPiece.ly and 
% create MyPieceDefinitions.ly from accTemplateDefinitions.ly.

\header { % adapt title, composer etc. to your piece
  title = "MyPiece"
  composer = "traditional"
}

\include "accDefinitions.ly"	% these are constant, define e.g. accTremolo

% Melody parts definition per piece, for both layout and MIDI; adapt these
aBase = {
    e1-5~ | e4 d(c-.) d-. | e2 d2 | c1-3 |
    c1-4~ | c4 d(c-.) b-. | \break 
    c2 a2-2 | g1-1 | e4-1(g-2 c-.-3) d | 
}    
bBase = { 
    e4-1(g-.-2)g-.g-.| a(g-.-2) g2-1 | a4-2 (c-.-4) c-. c-. | d-5(c-.-4) c2-3 | 
    g4-1 (c-.-3) c-. d-. | 
}

% Melody and chords definition per piece, for both layout and MIDI; adapt these
upperIntro = \relative g' { g4-.-1\accTremolo g \( fis-2 g-1 | e'2-5 d2 | c1~ \) | c4 r4 r2 | }
chordIntro = \chordmode { c1 | g:7 | c | c | }
upperAa = \relative e'' { \aBase e2-5 c2-3 | d1-4~ | d1            | \break }
chordAa = \chordmode { c1 | c | c | c |   f | f |    f | c | c | d:7 | g | g | }
upperAb = \relative e'' { \aBase e2-5 d2-4 | c1-3~ | c4-5 r4 r2    | \break }
chordAb = \chordmode { c1 | c | c | c |   f | f |    f | c | c | g:7 | c | c | }
upperBa = \relative e' { \bBase e2 c2 | d1-4~ | d1-5     | \break }
chordBa = \chordmode { c1 | c | f | f |     c | c2 d2:7      | g1 | g | }
upperBb = \relative e' { \bBase e2 d2 | c1~   | c4 r4 r2 | \break }
chordBb = \chordmode { c1 | c | f | f |         c | g:7 |   c | c | }
upperCa = \relative e'' { \aBase e2-5 c2-3 | d1-4~ | d1            | \break }
chordCa = \chordmode { c1 | c | c | c |   f | f |     f | c | c |   c2 d2:7 |      g1 | g | }
upperCb = \relative e'' { \aBase e2-5 d2-4 | c1-3~ | c4-5 r4 r2    | \break }
chordCb = \chordmode { c1 | c | c | c |   f | f |   f | c | c |    c2 g2:7 |       c1 | c | }
upper = {
    \upperIntro \break \upperAa \upperAb \pageBreak 
    \upperBa \upperBb \upperCa \upperCb
}
chord = { \chordIntro \chordAa \chordAb \chordBa \chordBb \chordCa \chordCb }

% layout part: make sure accLayoutDefinitions.ly contains all definitions you need
\include "accLayoutDefinitions.ly"   % should be constant, but make sure it's complete
first = { \qxc } % MIDI here needs a \p
\include "accTemplateDefinitions.ly" % copy this file and edit the copy; rename the included file

\score {
    <<
    \new PianoStaff <<
    \set PianoStaff.instrumentName = #"Accordion"
    \new Staff = "upper" { % adapt key, time if necessary
        \clef treble
	\key c \major
	\time 4/4
	\upper
    }
    % RhythmicStaff advantages: chords line closer to bass staff; disadvantage: not PianoStaff brace
%     \new RhythmicStaff = "lower" {
    % (normal) Staff advantage: PianoStaff brace; disadvantage: distance chords line - bass staff
    \new Staff = "lower" {
	\autoBeamOff
        \clef bass
	\override Staff.Stem #'transparent = ##t  % tell Stem_engraver not to print stems
	\override Staff.Beam #'transparent = ##t
	\override Staff.StaffSymbol #'line-count = 1  % or ledger-line-thickness 
	\lower
    }
>>
    \new ChordNames {
        \override VerticalAxisGroup #'nonstaff-unrelatedstaff-spacing = #'((basic-distance . 0) (minimum-distance . 0) (padding . 0) ( stretchability . 0))
%         \override VerticalAxisGroup #'nonstaff-relatedstaff-spacing = #'((basic-distance . 1))
%         \override VerticalAxisGroup #'staff-staff-spacing = #'((basic-distance . 1) (minimum-distance . 1) (padding . 1) ( stretchability . 0))
%         \override VerticalAxisGroup #'Y-extent = #'(0 . 0)%}
	\set chordChanges = ##t
	\chord
    }
    >>
    \layout { }
}

%{
\include "accMidiDefinitions.ly"
first = { c4\p } % bass usually needs lower volume; for this to work, we need a \p (piano) sign
\include "accTemplateDefinitions.ly" % rename the included file


\score {
<<
    \new Staff = "upper" { % adapt key, time if necessary
        \clef treble
	\key c \major
	\time 4/4
	\set Staff.midiInstrument = #"accordion"
	\upper
    }
    \new Staff = "lower" {
	\set Staff.midiInstrument = #"accordion"
	\set Staff.midiMinimumVolume = #0.3 % set bass volume
	\set Staff.midiMaximumVolume = #0.6
	\lower
    }
>>
    \midi {
	\context {
	    \Score
	    tempoWholesPerMinute = #(ly:make-moment 200 4) % adapt MIDI tempo
	}
    }
}%}