A few weeks ago at Austin City Limits, Canadian sister act Tegan and Sara treated Zilker Park to a few tracks from their upcoming album, the electro-tinged Heartthrob (and also joked about fainting in the unseasonable heat). One of those new jams was "I'm Not Your Hero," which the duo just unveiled online. What do we learn here? T&S did this tune justice live, highlighting the details in the slow-grooving synth pulses. Also: That massive chorus! Talk about catchy.