Sylvan Esso are folk musicians making Purity Ring-core dance-R&B — all of which is to say that they’re practically made for festivals. And it makes a big difference that Amelia Meath has swagger, and that she knows how to dance. Wearing entirely functional clothing other than her gigantic glittery clomping platform shoes, she’d do this robotic body-rolling thing during all her group’s instrumental parts, and it would be awesome. And when she threw a couple of seconds of Beyoncé’s “Flawless” into one song, it didn’t seem like a desperate crowd-pleasing move. It came off like a simple statement of badassery. (Shout out to all the groups of girls absolutely dumbing out to Sylvan Esso; you might’ve been my favorite people at the whole festival.)