“Those who lose dreaming are lost.” That’s an Aboriginal proverb that serves as a motto for Black Arm Band, Australia’s spectacular performance company. Specializing in Aboriginal and Torres Strait Islander music and languages, they are a link to the past and a hope for liberation. Here they give a performance of uncommon power—fervent, intoxicating and deeply moving. Against a backdrop of stunning documentary, the ensemble performs songs in a dozen languages, some now virtually extinct. With driving percussion, didgeridoo virtuosity, and some of the most soulful vocals you’ve ever heard, this show will bowl you over. Touring for the first time in Canada—in the 150th year of a nation born from the displacement of Indigenous peoples—dirtsong is more poignant than ever.