Dear Mark,
I’m just saying that underscores are not part of French typography, even less when they are used to hyphenate words. I’m wondering what they are supposed to be used for, in French.
[Edit] I checked, and they’re not supposed to be used at all, they’re not part of French typographic arsenal. They were primary used in old typing machines to underline words. Now they are part of computer jargon. I don’t think I would want to use them in as music score 