Add Label
Version 6.4.x
Label is part of annotation. See Add Annotation.
Version 6.3.x and Earlier
Labels have their own addLabel function.
Label text will be anchored to previously added note or rest.
// Add note/pitch label.
builder.addNote(0, "C#5", "1n").addLabel("note", "C#5");
// Add chord label.
builder.addChord(0, ["A3", "C4", "E4"], "1n").addLabel("chord", "Am");