The metronome type represents metronome marks and other metric relationships. The beat-unit group and per-minute element specify regular metronome marks. The metronome-note and metronome-relation elements allow for the specification of metric modulations and other metric relationships, such as swing tempo marks where two eighths are equated to a quarter note / eighth note triplet. Tied notes can be represented in both types of metronome marks by using the beat-unit-tied and metronome-tied elements. The parentheses attribute indicates whether or not to put the metronome mark in parentheses; its value is no if not specified. The print-object attribute is set to no in cases where the metronome element represents a relationship or range that is not displayed in the music notation.
The
<metronome>element.The metronome type represents metronome marks and other metric relationships. The beat-unit group and per-minute element specify regular metronome marks. The metronome-note and metronome-relation elements allow for the specification of metric modulations and other metric relationships, such as swing tempo marks where two eighths are equated to a quarter note / eighth note triplet. Tied notes can be represented in both types of metronome marks by using the beat-unit-tied and metronome-tied elements. The parentheses attribute indicates whether or not to put the metronome mark in parentheses; its value is no if not specified. The print-object attribute is set to no in cases where the metronome element represents a relationship or range that is not displayed in the music notation.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/metronome/