#(define bookStyle
  (if (not (defined? 'bookStyle))
      #f
      bookStyle))

#(define songStyle
  (if (not (defined? 'songStyle))
      (if (not (defined? 'defaultSongStyle)) 'default defaultSongStyle)
      songStyle))

#(if (not (boolean? bookStyle))
         (set! songStyle bookStyle))

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