+ADD_ACKNOWLEDGER (Rhythmic_column_engraver, stem);
+ADD_ACKNOWLEDGER (Rhythmic_column_engraver, rhythmic_head);
+ADD_ACKNOWLEDGER (Rhythmic_column_engraver, arpeggio);
+
+ADD_TRANSLATOR (Rhythmic_column_engraver,
+ /* doc */
+ "Generate @code{NoteColumn}, an object that groups stems,"
+ " note heads, and rests.",
+
+ /* create */
+ "NoteColumn ",