example data for authors and songs

lieder/vorlage_satz/vorlage_satz.ly

@@ -6,8 +6,8 @@ HEADER = \bookpart {
   \header {
     title = "Chorsatz"
     alttitle = ""
-    poetId = #'dude
-    composerId = #'dude
+    composerId = "dude"
+    songId = "a-song-id"
     categories = ""
     songinfo = ""
   }