How would you change the text font MusGlyphs uses?
I’d prefer something different for the ‘50~’ here. I will confess I have not studied the MusGlyphs Text section of the documentation. Is this covered there somewhere? Pardoion me for being totally lazy.
Just use another font for those characters ?
Those characters are part of the MusGlyphs font, so if you want different characters, you’ll need to use a different font, as @TonH suggests. You can change the font explicitly in the formatting toolbar, or define a character style that you can apply from there.
It would also work to use your default text style as the base, to get the numbers you want, and then apply a MusGlyphs character style to the other parts.
Here’s a case where I cant mark both answers as the solution. 
(I was really just expanding on why you need to use a different font. I believe all those characters in MusGlyphs come from Academico, btw, and the music characters come from Bravura.)