#(define book-style
  (if (not (defined? 'book-style))
      #f
      book-style))

#(define song-style
  (if (not (defined? 'song-style))
      'börnel
      song-style))

#(if (not (boolean? book-style))
         (set! song-style book-style))

#(define (bock-style layout props)
  "Whether we have bockstyle or not"
  (eq? song-style 'bock))