Kick the summer off right with iHeartRadio's KIIS FM Wango Tango by AT&T. The annual festival returns to Los Angeles with a stacked lineup of today's hottest music acts performing hit after hit live on stage. This year's lineup features pop superstar Ariana Grande, already climbing the charts with her new single "No Tears Left to Cry," along with singer-songwriter sensation Shawn Mendes ("Treat You Better") delivering heartfelt pop ballads, and Meghan Trainor will get the crowd moving to hits like "All About That Bass" along with new tracks. Making their much-anticipated return, Backstreet Boys will bring some nostalgia with timeless favorites like "I Want It That Way," plus show off some of the new stuff. Rounding out the day are 5 Seconds Of Summer, Marshmello, Miguel, Sabrina Carpenter, Janelle Monae, plus a special guest performance by Logic and more. Hosted by Ryan Seacrest and the first concert at the all-new state-of-the-art Banc of California Stadium in Downtown LA, this is an event that cannot be missed.