Thanks, ya, the forward-slash seemed to be the other most common...
It seems forward slashes tend to be used on the less common tags and semi-colons are used more on the more common tags like Genre and Artists.
I'll test the forward-slash with spaces also and see what it does.
Drives me nuts that there's no consistency... It's like I hate that the "Date" isn't consistent either, the primary date should be when the song first came out by the artist, then we can have Album Date, and Remix/Remastered Date. Those are the only primary dates we need, the most important one being the original release date. But instead, most dates are Album release dates, and that ticks me off for those who might want to music of different years.
Anyway, ya, I'm using Picard also along with Mp3tag... Going crazy, but thank you.

Oh btw, I've discovered that Picard's Genre tag doesn't like certain separators, it won't show multi-genres if you like use a single slash or something, the semi-colon and backward slashes seem fine to it.
Oh, and I also discovered that if you use backslashes in Picard for Genre and Artist, and then open in Mp3tag, and even save, for some reason MusicBee and Windows explorer shows the backward slashes instead of semi-colons, as they do when you're "editing" the tags adding the backslashes with Mp3tag.
There's all kinds of weird crap, it's frustrating trying to figure it all out....