I caught the top 6 of the Top 100 of 03 on Kiss 108 (Boston) and it was the same as the "Year-To-Date" on Mediabase, except Bring Me To Life & Where Is The Love were flipped...
on Mediabase...
1 JUSTIN TIMBERLAKE Rock Your Body
2 MATCHBOX TWENTY Unwell
3 3 DOORS DOWN When I'm Gone
4 CHRISTINA AGUILERA Fighter
5 EVANESCENCE Bring Me To Life
6 BLACK EYED PEAS Where Is The Love
on the actual broadcasted countdown...
1 JUSTIN TIMBERLAKE Rock Your Body
2 MATCHBOX TWENTY Unwell
3 3 DOORS DOWN When I'm Gone
4 CHRISTINA AGUILERA Fighter
5 BLACK EYED PEAS Where Is The Love
6 EVANESCENCE Bring Me To Life
So I dont know what they used...maybe Kiss used more charts dates in late Nov/Dec then Mediabase did?? But their weekly top 30 is nothing related to the top 30 Mediabase has for the individual stations...