Empire Polo Club, Indio, California The English indie rock band’s first festival set in eight years hypnotized with their atmospheric dance sound Empire Polo Club, Indio, California The English indie rock band’s first festival set in eight years hypnotized with their atmospheric dance sound W hen Jamie Smith, Oliver Sim and Romy Madley Croft took the Coachella main stage on Friday evening, you could be forgiven for forgetting the momentousness of the occasion. The trio known as the xx has not