Well I suspected this for a long time but I finally confirmed it. I have the game and so does my brother. I played this one song so many times and even after getting every color block (mono pro) and stealth, I was still 8,000 points away from another guy who did the same song and same mode. So I copied the music file to my brother's computer and played the song on the same settings, the result was a completely different distribution of blocks on the track! I tried this with multiple files and they're always different on his computer! So are these scoreboards completely non-representative of anything but your own score? I'm thinking that even if the track 'shape' looks the same when you hover over someone else's score, there are no two people every playing the same song on the same track.