Paramore's "Ain't It Fun" Is The Summer Jam Twitter Desperately Needs

It's a pleasantly sweaty June night at the bucolic, Live Nation-owned Xfinity Center in Mansfield, Mass., and Hayley Williams looks like she's ready for a fight. The lead singer of Paramore is sporting the kind of high-waisted shorts, knee braces, and white high-tops you might associate with a sparring boxer. But… » 7/07/14 2:36pm 7/07/14 2:36pm