We’ve known the date, July 17th, for a little while now, but this morning brings word of the 2010 Siren Festival lineup, which, hey, is a total doozy. This year marks the tenth anniversary of the free, outdoor show that was the sweat-soaked, Brooklyn-based centerpiece of every music nerd’s summer long before Jelly, and certainly Northside, came around. To celebrate, they’ve asked back some performers from previous years. So far, the lineup features Matt & Kim (2007), Ted Leo (2003), Surfer Blood, The Pains of Being Pure at Heart and Harlem, with DJs and additional performers to be announced soon. God, the summer is awesome.