Surrounding the success lurks something darker. In front of a packed house outside Cleveland's Rock and Roll Hall of Fame and Museum, singer Oliver Sykes took the mic and confessed he's been in rehab for a month combating a ketamine addiction. "I was on it for years. My band wanted to kill me, my parents wanted to kill me, my brother wanted to kill me, everyone wanted to take me to hell but they didn't. They stood by me, they supported me through all that s-t and we wrote Sempiternal because of it."

Radio.com caught up with Sykes and the band's newest member, Jordan Fish, backstage before a performance at the historic Shrine Auditorium in Los Angeles. The two were refreshingly opinionated and thought-provoking.

Sykes explained the album's synth-heavy hit song "Can You Feel My Heart" started out as a much darker track. "We always wanted it to be the first track on the album," said Sykes. "We just kept going over and over and over." It wasn't until they added the "skippy vocals," that it started to take shape and stand apart from the rest. "That's when we said this is cool, this is different. We always dug the song and the direction but to get it to be the first song on the album it had to be perfect."

One song that beckoned an explanation was "Antivist," a track in which Sykes demands the listener to question everything, and more importantly, think through heavy topics before choosing a point of view.

"You can't tell people eating meat is wrong and eat it yourself," says Sykes. "You can't have a go at all the massive oil companies and then drive a car. I see people saying Apple is destroying the earth and yet they're tweeting it from their iPhone. We're just living in a mad world where people think they've got the right to say any old s-t without thinking twice."