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diff --git a/doc/tutorial/music/MusicI.gf b/doc/tutorial/music/MusicI.gf
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+++ b/doc/tutorial/music/MusicI.gf
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+  incomplete concrete MusicI of Music = open Syntax, MusicLex in {
+    lincat 
+      Kind = CN ;
+      Property = AP ;
+    lin
+      PropKind k p = mkCN p k ;
+      Song = mkCN song_N ;
+      American = mkAP american_A ;
+    }