Serj Tankian will be the first to admit that his band, System Of A Down, was “unlikely a chart-topper as had ever existed in modern music history: a band of Armenian-Americans playing a practically unclassifiable clash of wildly aggressive metal riffs, unconventional tempo-twisting rhythms, and Armenian folk melodies, with me alternately growling, screaming, and crooning lyrics that could pivot from avant-garde silliness to raging socio-political rants in the space of a single line.” After all, as Serj concedes, “it’s not easy listening.”

Even so, there’s no doubt that System’s music had struck a chord with millions of listeners across the globe ever since they burst on the scene in the mid-1990s. With nearly 40 million album sales, three albums topping the Billboard charts, and a devote...

Serj Tankian will be the first to admit that his band, System Of A Down, was “unlikely a chart-topper as had ever existed in modern music history: a band of Armenian-Americans playing a practically unclassifiable clash of wildly aggressive metal riffs, unconventional tempo-twisting rhythms, and Armenian folk melodies, with me alternately growling, screaming, and crooning lyrics that could pivot from avant-garde silliness to raging socio-political rants in the space of a single line.” After all, as Serj concedes, “it’s not easy listening.”

Even so, there’s no doubt that System’s music had struck a chord with millions of listeners across the globe ever since they burst on the scene in the mid-1990s. With nearly 40 million album sales, three albums topping the Billboard charts, and a devote...