By Piya Sinha-Roy INDIO, California (Reuters) - British bands kicked off Southern California's annual Coachella music festival on Friday, with Blur and The Stone Roses taking to the stage, while a surprise video from French duo Daft Punk had fans abuzz. Blur, who led a new wave of rock-infused Britpop in the 1990s and recently reunited after a six-year hiatus, brought their trademark no-frills style to the Coachella main stage on Friday evening. ...