#(define bookpart-text-handler ly:book-add-score!)
#(define bookpart-music-handler collect-book-music-for-book)
#(define output-def-music-handler context-defs-from-music)
+#(define context-mod-music-handler context-mod-from-music)
\include "predefined-fretboards-init.ly"
\include "string-tunings-init.ly"