Here’s a video of Alison Krauss performing at The White House on Monday, with the able assistance of Sierra Hull and Dan Tyminski.
She was invited by the First lady as a part of a night of country music in Washington, and with Union Station officially on hiatus, Krauss brought Dan and Sierra along for backup.
http://www.youtube.com/watch?v=IyPY_agPP0YThis was actually her second command performance during the Obama Presidency, having been there before with her band in July of 2009.