hmmm....few things. Firstly, if you want an Author to show up as unkown you don't have to enter "Unkown" you just don't put that song number in there at all. as for the genre, I take it you just want that to show up empty? You could even find the lines that say
if $game_system.playback_list[@playback_bgm] != nil
text3 = "Genre: " + $game_system.playback_list[@playback_bgm][2]
else
text3 = "Genre: Unkown"
end
and
self.contents.draw_text(0,72,self.contents.width,32,text3,1)
and take them out IF you do not want the word "Genre" to display at all.
thirdly, what version of my script are you using? Strangely enough I can't actually seem to find the line you posted in my script o.O leading me to believe the script is probably an old version, perhaps from the demo?
Anyway, you might want to just make a back-up, and try using script v1.15 instead (which is in the spoiler tags in my first post). You won't need to set up the actual song-names for any custom songs you have, just the songs from the RTP if you wish to use them. The author and genre's still need to be set up in the old way though, keeping in mind that the order of songs is -> your custom songs (arranged alphabetically) followed by the RTP songs you've specified (arranged in the order you specified)
Hope it helps.