A while back we dug up a bunch of hidden similarities between Owl City — a.k.a. Adam Young, the young man behind “Fireflies” — and Ben Gibbard, one-half of Postal Service, the band that “Fireflies” sounds exactly like. We just found one huge difference, though: Ben Gibbard, most likely, will never get the chance to incorporate bird suits into his live act. All this and more in our roundup of the weekend in rock photos, including Adam Green, Los Campesinos!, Hot Chip, Gang Gang Dance, Harlem, Titus Andronicus, Morning Benders, Charlotte Gainsbourg, Das Racist, and Elvis Costello.