Quartet formed on The X Factor in America after they were discovered by Simon Cowell. They won Best Song at both the 2015 and 2017 Teen Choice Awards. They went on hiatus in May of 2018.
Their 2017 PSA Tour is their first complete tour without Camila Cabello, who left the band in December 2016. The Filharmonic opened for them on their 7/27 Tour in 2017.