Sprint Cup drivers show humor, intensity

NASCAR Sprint Cup drivers have selected their introduction songs for Sunday's Jeff Byrd 500 at Bristol Motor Speedway.
And some of those choices offer insight into what may be to come in the race at the .533-mile concrete oval.

Here's a look at some of the choices drivers made:

Jimmie Johnson and Brian Vickers are selecting each other's songs and have chosen to keep them a secret until they are introduced. Dale Earnhardt Jr. and Mark Martin also are being tight-lipped about their choices.