JESSICA RABBITFor Sleigh Bells, the blurring boundaries between pop's mainstream and underground were a blessing and a curse. Though they cranked out three albums of subversive sweetness and noise in as many years, Top 40 pop caught up with them almost as quickly: Demi Lovato's 2015 album Confident featured a song that sounded similar enough to their work that they sued for copyright infringement. More importantly, by the time they released Bitter Rivals, it felt