Enclosures for editorial notes, accidentals, articulations, etc.
These class-based attributes use data.ENCLOSURE
att.enclosingChars/@encloseRecords the characters often used to mark accidentals, articulations, and sometimes
notes as having a cautionary or editorial function. For an example of cautionary
accidentals enclosed in parentheses, see Read, p. 131, ex. 9-14.