But all that is set to change. The Coldplay frontman said the band's new album has been inspired by people who aren't afraid to speak out and stand up for what they believe in.
He said that the lyrics in particular have been inspired by New York graffiti and the White Rose Movement - a group of German children in World War II who printed anti-Nazi flyers.
The father-of-two told Q Magazine: 'I admire it. I've spent a lot of my life playing it a bit safe or conforming to something, even though I didn't agree with it. So I have respect and admiration for people who don't.
'The ideas come from graffiti art of the 70s in New York, where people were expressing themselves with paint. Then there was the White Rose Movement. Anybody who's standing up for themselves.
'It's about being free to be yourself and to express yourself among negative surroundings. Being able to speak out or follow your passion, even if everybody seems against it.'
The band is still in the process of recording their fifth album, but he gave a hint at the title: ' It will probably begin with an 'M'. Two words.”