here's a stat on who's debuted on the chart at #1, there's been a few of them, but it hasn't happened for quite some time (without checking, i'd say 3 years??)

Ol' Red - Blake Shelton
Unusually Unusual - Lonestar
Brokenheartsville - Joe Nichols
The Truth About Men - Tracy Byrd
Who Would'nt Wanna Be Me - Keith Urban