Last night Feist took the Letterman stage with a few of her friends. Nicole Atkins, A.C. Newman, Broken Social Scene's Kevin Drew and members of Brooklyn bands The National and Grizzly Bear were her backup singers, taking a page from the Bright Eyes guide to stage wear and donning all white. Watch it below...

Later most of the crew made it over to Pianos for rock n' roll trivia (some helping to host) -- not surprising as a couple of them are regulars. Some of the group, still in white, even kept the singing going out on the sidewalk after the questions ran out. We told you it's fun!

Most of the above will also be performing at McCarren Park Pool tomorrow night. The show is sold out but you could likely hear it fine from a blanket just outside the venue.