Is this the idea?
\version "2.18.2" rotateBracket = #(define-music-function (parser location input) (pair?) #{ \once \override HorizontalBracket.bracket-flare = $input #}) \relative { \rotateBracket #'(2 . 4) b\startGroup b\stopGroup } \layout { \context { \Voice \consists "Horizontal_bracket_engraver" } } Stephen
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