Green Day's Billie Joe Armstrong was pulling his "hair out" whilst making the band's new album.
The 47-year-old singer has admitted to experimenting with various sounds during the recording sessions for 'Father of All Motherf***ers', which is poised for release in February 2020.
He explained: "I knew I wanted to do something different.
"I'd always loved British mod music from the Sixties, but I wanted to go to where the source was and see if I could put [soul] through the Green Day filter.
"It was a lot of trial and error, a lot of pulling my f***ing hair out."
Meanwhile, Billie's bandmate Mike Dirnt thinks the popular band is currently making some of the best music they've ever made.
And the 47-year-old bassist is happy and relieved he's managed to remain at the top of the music industry for so many years.
Speaking to Rolling Stone, Mike - who formed the chart-topping band alongside Billie in 1986 - shared: "It's been a f***ing crazy ride.
"How the hell I'm vertical and still putting out what I consider to be the best f***ing music of our career is beyond me. I'm humbled by it all the time, but I'm still hungry and I still wanna kick a lot of ass."