I own a copy of the single disc "Master Karaoke" album from Japan (this is the reissue from "Best of Best", containing the instrumentals ONLY). I was told some time back that there were liner notes included in the original "Best of Best" that gave an explanation as to why on 'Superstar', Karen's lead vocal bled through onto the instrumental bed of the track. Can anyone recall Richard's explanation as to which track(s) the vocal bleed-over took place? It's not totally uncommon that something like this would happen, I have just always wondered what the real story was on that.....-Chris