Twenty One Pilots formed in 2009 in Columbus, Ohio by Tyler Joseph, Nick Thomas, Chris Salih and Josh Dun. By 2011, only Joseph and Dun remained active in the band. Their most popular albums include Regional at Best, Vessel, and Blurryface, with hit songs like "Stressed Out" and "Heathens". Musically they combine alternative hip hop, rock, pop and rap into a unique "schizophrenic pop" sound.