@end menu
@node Chorded notes
-@unnumberedsubsubsec Chorded notes
+@subsubsection Chorded notes
@cindex Chords
@node Clusters
-@unnumberedsubsubsec Clusters
+@subsubsection Clusters
@cindex cluster
@end menu
@node Collision resolution
-@unnumberedsubsubsec Collision resolution
+@subsubsection Collision resolution
@cindex merging notes
@cindex note collisions
@node Automatic part combining
-@unnumberedsubsubsec Automatic part combining
+@subsubsection Automatic part combining
@cindex automatic part combining
@cindex part combiner
@cindex combining parts
@node Writing music in parallel
-@unnumberedsubsubsec Writing music in parallel
+@subsubsection Writing music in parallel
@cindex Writing music in parallel
@cindex Interleaved music