[pkscout]

To display artist info during music visualization, I use the following:

Code:

<label>$INFO[MusicPlayer.Property(Artist_Description)]$INFO[Window(Visualisation).Property(ArtistSlideshow.ArtistBiography), - ]</label>

I'm trying to figure out where this artist info is stored so I can edit some. Is it ...addon_data\script.artistslideshow\ArtistInformation ?
If so, how come AS Helper doesn't migrate that data to the output folder, like it does images?

Yes, the artist information is stored in the location you indicated. AS Helper doesn't move it because there is no option to have that data interspersed with "local" data from the end user. You can edit those files, but they will be overwritten next time AS updates them (which is every couple of weeks). You have two choices if you want to edit that info:

1- go to the source site (theaudiodb.com or last.fm) and edit the material there. If you do that then either delete the artist information folder for that artist or wait until AS updates the bio and such.
2- Take a look at the wiki for the information on override folders. This lets you use local information to populate the artist info rather than the remote info from theaudiodb.com or last.fm.