It's been disclosed that the Inauguration moment I enjoyed the most didn't actually happen live, as viewers were led to believe.
Yo-Yo Ma, Itzhak Perlman, Gabriela Montero and Anthony McGill played a lovely, joyous John Williams arrangement of "Simple Gifts"...well, sort of.
Coming from a family of musicians, I was impressed with how in tune the instruments were, given the bitterly cold weather, but I chalked it up to the extreme professionalism and abilities of the musicians. Turns out they were doing the equivalent of lip-synching...maybe it should be called instrument-synching...playing along with a tape which the musicians could hear via earpieces.
The Marine Band and choruses, on the other hand, did not use recordings and were performing live.