CMT Top 20 Countdown   -  About the Episode

Start your engines as this week's Top 20 Countdown takes a road trip to the Atlanta Motor Speedway for the Kobalt Tools 500. Watch as guest host Allison DeMarcus chats with Georgia native Luke Bryan, along with NASCAR drivers Jimmie Johnson and Carl Edwards. Also on the show, get a preview from the upcoming episode of CMT Crossroads as Jimmy Buffett and Zac Brown Band share the stage for "Margaritaville." Then find out if Carrie Underwood's latest hit, "Temporary Home," can hold on to the No. 1 spot for the third week in a row. Check out videos from Chris Young, Jewel and Taylor Swift on Top 20 Countdown. See photos from the set and more.