Riddle us this: in a city where the club scene often wants for edgy live music, and in an economy where it's pretty hard to expect something for nothing, how on earth have we come across a week-long series of free shows featuring some of the best in alternative rock? We'd be more confused if this wasn't Disorientation 2009, the latest installment of the annual lineup of free concerts from WFNX and the Boston Phoenix. Every weeknight at 7 p.m., the doors open at The Lansdowne (9 Lansdowne Street, Boston, 617.247.1222) for a different alt-rock band you know and love, or soon will: this year's headliners include Wild Light, Owl City, Matt and Kim, White Lies, and White Rabbits. To get inside, you don't need to pay - just visit the WFNX website (wfnx.com/disorientation) and RSVP for the events you want to attend. You'll still want to show up early in case the club reaches capacity, but you can also listen to WFNX to hear ways to win tickets that are guaranteed to take you straight inside. Ah, disorientation made clear.