I used to have ripped music that had em dashes in the filenames. But several music players displayed a question mark for it. So I replaced them all with a hyphen.

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al_be_back an hour ago | parent [-]

Very interesting. The media tracks may've been em dashed during prod. Spotify seems to use this format "Artist — Album".

	▲	mark_something 28 minutes ago \| parent [-]
		I ripped music from both CDs and Internet radio (not Spotify). I remember there were definitely em dashes in those from Internet radio, but I'm not sure whether they also occurred in those from CDs — those filenames probably came from an online DB. Of course the Internet radios might have ripped the music in the same way.