If we needed evidence that electronic dance music is a force in pop culture, last weekend's Ultra Music Festival held downtown here provided it. Some 150,000 tickets were sold to the three-day event--about equal to the total for last year's Coachella Music & Arts Festival in the desert town of Indio, Calif., and about twice the number for June's Bonnaroo Music & Arts Festival in Manchester, Tenn.Posted by jez at April 2, 2011 6:46 PM | Subscribe to this site via RSS:Whereas Coachella 2011, next month, will feature Arcade Fire, Kanye West, Kings of Leon and the Strokes as its rock and pop headliners, and Bonnaroo will offer Eminem, Robert Plant & Band of Joy and a reunited Buffalo Springfield (as well as Arcade Fire and the Strokes), the biggest name at Ultra Music--at least to a mainstream audience--was Duran Duran, which was here to promote its new album. But traditional measurements for rock-and-pop success are irrelevant in the electronic-dance culture. Witness Tiësto, the stage name of the Dutch disc jockey, producer and composer Tijs Michiel Verwest, the headliner on Friday, Ultra's opening night. Though he's never had a crossover radio hit and his solo albums sell modestly, Tiësto is a major international star, as confirmed by one familiar evaluation: His annual income apparently exceeds $20 million.