Performing "Air and Simple Gifts", composed by John Williams, Yo-Yo MA, cellist, Anthony McGill, clarinetist, Gabriela Montero, pianist and Itzhak Perlmen, violinist preceded President Barack Obama's oath of office.
One crazy thing I noticed about this amazing group of musicians - they were preforming in very cold weather with instruments that cost millions of dollars. If you think I'm crazy - look it up. If you know anything about wood instruments - you do not, and I repeat, you do not take your 2 million dollar cello out in the cold and play it. It could fall apart. At the very least, it will not stay in tune. I know Yo Yo Ma did not play on his normal cello but his secondary cello has to cost in the millions. Crazy don't you think?
UPDATE: Check out this article regarding the performance.