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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