Jason Aldean once called Nashville "Hollywood with a touch of twang," and rocker Shawn Mullins deemed Los Angeles "kind of like Nashville with a tan," so it's only natural that the stars from each city would intermingle -- personally and professionally.
On Nov. 15, 2003, Keith earned his 12th No. 1 single with "I Love This Bar," but chances are good that he had no idea just how much the song would affect his life.
At the start of 2006, Carrie Underwood had an 'American Idol' victory and two No. 1 hits to her name -- but by the end of the year, her career had reached a new height, thanks in part to her mega-hit "Before He Cheats."