Bonjour Christian,
La solution se trouve sur la LSR:
http://lsr.di.unimi.it/LSR/Item?id=902
\version "2.19.35"
startParenthesis = {
\once \override ParenthesesItem.stencils = #(lambda (grob)
(let ((par-list (parentheses-item::calc-parenthesis-stencils grob)))
(list (car par-list) point-stencil )))
}
endParenthesis = {
\once \override ParenthesesItem.stencils = #(lambda (grob)
(let ((par-list (parentheses-item::calc-parenthesis-stencils grob)))
(list point-stencil (cadr par-list))))
}
LesAccordOssia = \new ChordNames {
%\mark \markup{(} e2 a g d\mark \markup{)}
\startParenthesis\parenthesize e2 a g
\endParenthesis\parenthesize d
}
LesAccords= \new ChordNames { c1 f a b }
LeChant = \relative c' { c4 g' d a' f a c e }
\score
{
<<
\LesAccordOssia
\LesAccords
\LeChant
>>
\layout {}
}