Inhaltlich sinnvollere Aufteilung der include Skripte

standalone_output.ly

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+% set the speed of the midi music
+#(define midiQuarterNoteSpeed (if (defined? 'midiQuarterNoteSpeed) midiQuarterNoteSpeed 90))
+
+% nur Output wenn noStandaloneOutput auf false steht
+output = #(if (not noStandaloneOutput)
+#{
+  \bookpart {
+    \HEADER
+
+    \score {
+      \MUSIC
+      \layout { \LAYOUT }
+    }
+
+    \TEXT
+
+    \score {
+      \unfoldRepeats \MUSIC
+      \midi {
+        \context {
+          \Score
+          % Tempo des midi files
+          tempoWholesPerMinute = #(ly:make-moment midiQuarterNoteSpeed 4)
+        }
+      }
+    }
+
+
+  }
+#}
+)
+
+% if we don't want a standalone output, cause we compile a book, we just have an empty output here,
+% so lilypond does not generate output for this song
+\book {
+  \bookpart { \output }
+}