The defaults type specifies score-wide defaults for scaling; whether or not the file is a concert score; layout; and default values for the music font, word font, lyric font, and lyric language. Except for the concert-score element, if any defaults are missing, the choice of what to use is determined by the application.
The
<defaults>element.The defaults type specifies score-wide defaults for scaling; whether or not the file is a concert score; layout; and default values for the music font, word font, lyric font, and lyric language. Except for the concert-score element, if any defaults are missing, the choice of what to use is determined by the application.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/defaults/