It's a new month and a new No. 1 on CMT Hot 20 Countdown. Could it be Jason Aldean? See where his rapidly-ascending "Night Train" video lands on the countdown while we give you some staggering facts regarding his current tour. What's Eric Church doing with Kenny Chesney? We'll let you know. Plus, we'll show our appreciation for our favorite teachers and give you the lowdown on the best Oktoberfest celebrations in the U.S. this week on CMT Hot 20 Countdown. Don't miss it.