Check out this week's edition of CMT Hot 20 Countdown as we venture over to the Country Music Hall of Fame and Museum in downtown Nashville. You're sure to love the one-of-a-kind memorabilia from country's biggest names. Also, Dierks Bentley's latest video, "I Hold On," debuts on the show. Tune in to see where it lands. Plus check out bonus videos from Garth Brooks and Trisha Yearwood, along with the Cadillac Three. Then get a peek at Jake Owen's Luke Bryan impression and see which tune was at the top of the countdown one year ago.