Bonsoir Vincent,
cf. lsr:
http://lsr.di.unimi.it/LSR/Item?id=902\version "2.18.2"
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))))
}
\new ChordNames \chordmode {
\override ParenthesesItem.font-size = #3
\startParenthesis \parenthesize e:m7 \endParenthesis \parenthesize a:7
}