Twenty One Pilots perform onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on Sept. 23, 2016 in Las Vegas.

Backstage at iHeartRadio Music Festival 2016, Billboard caught up with Twenty One Pilots’ Tyler Joseph and Josh Dun to discuss the status of their next album, the follow-up to 2015’s Blurryface.

The “Heathens” duo -- who were on the Las Vegas festival's lineup Friday (Sept. 23) -- admitted they’re not very far into the album-making process, but they do know the approach they need to take.

Twenty One Pilots' 'Heathens' Takes Over as Top Song on Rock Radio

"It's just ideas right now," Joseph told Billboard.

He went on to say: “It has to have a narrative. It needs to be a story. So the question is where do we want to take our fans next -- not just with the music, but also the show. We take a lot of pride in our live show."

Watch the interview clip below.