Horizon Music Series is back and better than ever, taking place at the beautiful Waterfront Park in downtown San Diego on Saturday, June 17th. This year's lineup and headliner includes one of the biggest names in electronic dance music (EDM), the world-renowned Tiësto, who has been voted Mix magazine's "Greatest DJ of all time." This marks Tiësto's first outdoor performance in San Diego in over a decade, making it an event not to be missed.