Tegan and Sara

These Canadian twins tour behind The Con X: Covers, in which the duo's poignant indie pop tunes off their pivotal 2007 album The Con get treatments from a host of guest artists (Ryan Adams, Hayley Williams, Chvrches…). Though once all layered vocals and tempered angst, the duo has skewed a bit more mainstream recently. Nonetheless, it's difficult to stay mad when we're having so much fun dancing to "Boyfriend."