…title, and a title in the TOC \piece markup adds a piece title in the TOC \titledPiece markup adds a piece title in book body and …
…#(define-markup-command (when-property layout props symbol markp) (symbol? markup?) (if (chain-assoc-get symbol props) (interpret-markup layout props markp) (… …d' e' f' \break } \section "Scene 2" \piece \markup { Choir: \italic { bla bla bla } } \repeat unfold 12 { … …break } \chapter "Act II" \section "Scene 1" \titledPiece \markup Overtura { c'4 d' e' f' g'1 }