En fait si, je crois que ça répond à toutes tes questions :
#(set-global-staff-size 20) %taille des portées
%---------------------------------------------
\paper
{
oddFooterMarkup = \markup {\override #'(font-name . "LilyJAZZText")\fontsize #3 \fill-line { \fromproperty #'header:title } }
print-page-number = ##t
#(define fonts
(set-global-fonts
#:music "lilyjazz"
#:brace "lilyjazz"
#:roman "lilyjazz-text"
#:sans "lilyjazz-chord"
#:factor (/ staff-height pt 20)
))
}
%----------------------------------------------
Global=
{
\numericTimeSignature
\set Score.markFormatter = #format-mark-box-alphabet
\time 4/4
\partial 4
\key ees\major
}
%--------------------------------------------
LaMainDroite =
\new Staff
\relative c''
{
\clef "treble"
\Global
\tuplet3/2{bes8-1 c d}ees4 d8 ees f4 ees
}
%-----------------------------------------------
LaMainGauche =
\new Staff
\relative c,
{
\clef "bass"
\Global
s4 ees'4-3 <g-1 bes-2> bes,-5 <g'-1 bes-2 >
}
%------------------------------------------------
\score
{
<<
\new PianoStaff
<<
\set PianoStaff.connectArpeggios = ##t
\override PianoStaff.Arpeggio.stencil = #ly:arpeggio::brew-chord-bracket
\LaMainDroite
\LaMainGauche
>>
>>
\layout { }
}