iHeartRadio Countdown - Weekend of August 5th, 2017

It's another big weekend on The iHeartRadio Countdown with Mario Lopez! We're talking all about the massive iHeartRadio Music Festival going down in Vegas this September. Plus we have several new Countdown debuts, tons of Mario's favorite throwbacks and more! Plus can Imagine Dragons hang onto the #1 spot for a fifth straight week with 'Believer'? Tune in to find out!

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