How do you justify the existence of an EDM documentary in 2018? In the opening moments of Bert Marcus and Cyrus Saidi’s What We Started, an attempted chronicle of the genre’s beginnings and never-endings that drops later this week, journalist Kerri Mason unknowingly offers an explanation: “The biggest misconception is that dance music is a new thing.” Even if the statement isn’t strictly true, it speaks to the general perception of EDM’s rise (and eventual sorta-fall) as the rare economic juggernaut in a perpetually skint music industry.