I am a sucker for a good spontanious crowd sing-a-long at a concert. It is one of the ways the crowd can show they are into it because lord knows nothing can kill a good set like a dead crowd. At the Rilo Kiley show the other night there was a pretty classic sing-a-long. Below is a link to a video I shot of Rilo Kiley at Avalon on Friday night where the crowd came in to sing-a-long during the song "With Arms Outstretched." http://www.youtube.com/watch?v=PNZ86FBiXr4