Formed in 2012, all band members are reportedly hand-picked by North Korean leader Kim Jong-un himself.
Their music is a synthesiser-heavy mix of Western classics and Pyongyang propaganda songs including "We Call Him Father" - an ode to Mr Kim.
The changing line-up is made up of singers and multi-instrumentalists, playing anything from electric guitars to synthesiser, violin and saxophone.
In 2015, the band was rumoured to have been purged, even executed, when it briefly vanished from public view for several weeks.