The voice of Austra leader Katie Stelmanis is a confident quiver, full of worries and questions but also built on the belief that those concerns matter. Her torchy tone is the centerpiece of Austra's songs, which pair senses of texture and rhythm so busy and vibrant they recall IDM to melody and momentum so strong they suggest Top 40 radio waves. If you've ever wanted Zola Jesus to be a bit less circumspect, or step out of the goth shadows of her own design, try Austra. Meanwhile, Perpetual Surrender—the promising debut from fellow Toronto band Diana—rips pop songs apart by inserting complicated flourishes such as shards of noise or pleasant tangents such as saxophone solos into illogical but yielding spaces. Singer Carmen Elle is less the leader and more the instrument here, slipping into these complex productions as though they'd simply been waiting on her to arrive.