We're back in Music City for this week's CMT Hot 20 Countdown. Tune in as we reveal the No. 26 artist on CMT All-Time Top 40: Artists' Choice. Plus, we'll give you the scoop on what Blake Shelton describes as "the worst experience of my life." Then see our picks for the best bad-girl videos in this week's High 5. And don't miss Twitter and Twang as we feature tweets from proud papas in country music.