The <group-name> element.
<group-name>
The group-name type describes the name or abbreviation of a part-group element. Formatting attributes in the group-name type are deprecated in Version 2.0 in favor of the new group-name-display and group-abbreviation-display elements.
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/group-name/
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The
<group-name>element.The group-name type describes the name or abbreviation of a part-group element. Formatting attributes in the group-name type are deprecated in Version 2.0 in favor of the new group-name-display and group-abbreviation-display elements.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/group-name/