Speedy Ortiz kicked off Sunday’s Blue Stage schedule with a burst of scrappy garage rock chords. As Sadie Dupuis sang the verses in an almost understated manner, the songs occasionally loped into off-kilter rhythms, bringing to mind the early music of Liz Phair. The three guys in this band kept the music charging forward, but the focus was all on Dupuis, whose voice rose to pleading peaks in the refrains of her songs. Whenever the time came for an instrumental break, she seemed to revel in stepping back from the mic and whipping her hand across her guitar strings. (Robert Loerzel)