How might I replicate these? Specifically the enclosures.
THANKS
Those boxes are probably built into the font. I don’t remember font names offhand but you can search the internet for “rehearsal fonts”.
Most of the “Pretend Pen” 
fonts contain glyphs for constructing these boxes - Finale Jazz Text, Broadway Text, Golden Age, etc.
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Ben’s right. That looks like Finale Jazz Text to me which contains all of these enclosure options:
Thank you, Ben, Fred, Mark. Any resources on how to create them?
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https://usermanuals.finalemusic.com/FinaleWin/Content/Finale/font-jazz.htm
Scroll down to Finale Jazz Text Character Set and click on Enclosures. That will tell you what ALT+ code to enter to get either the predefined rehearsal letters, or the codes for the various enclosures.
Appreciate it. Thanks.
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Hi Fred, I’m struggling where to modify. Music symbols?
Hmmm, changing some of those items seems to be quite a bit trickier than it initially appeared. Unless I overlooked them, the Segno and Coda ball don’t have definitions in Music Symbols. They also don’t seem to appear in glyphs.xml or composites.xml either, meaning Dorico is hardwired to look for those glyphs in a specific spot in a SMuFL font, so therefore can’t be overridden with a doricolib file.
I think you’ll end up just using System Text for everything using this style. Not ideal, but it works.
Thank you