code: Rule FieldLyrics() {
  		return Sequence(
  				String("w:"),
  				ZeroOrMore(WSP()).suppressNode(),
  				Lyrics(),
  				HeaderEol())
  			.label(FieldLyrics);
  	}
docs: field-lyrics ::= %x56.3A *WSP lyrics header-eol
  <p><tt>w:</tt> formatted lyrics printed under staff