This weekend on The iHeartRadio Countdown with Mario Lopez lead single of Maroon 5 Adam Levine joins us! Word on the street is Maroon 5 is working on new music so we'll get to the bottom of that. Plus find out the latest on the current season of 'The Voice' over on NBC. So we'll catch up with him, play some throwback classics, countdown the top 20 and find out if Halsey can hang at the top spot for another week. Tune in!