@end lilypond
When typesetting a piece in Gregorian chant notation, the
-@rinternals{Gregorian_ligature_engraver} automatically selects the proper
+@rinternals{Vaticana_ligature_engraver} automatically selects the proper
note heads, so there is no need to explicitly set the note head style.
Still, the note head style can be set, e.g., to @code{vaticana_punctum} to
produce punctum neumes. Similarly, the