Watch Yo-Yo Ma and Gabriela Montero live at Obama's inauguration.

Yo-Yo Ma

Cellist Yo-Yo Ma and pianist Gabriela Montero were among the performers participating in Barack Obama's inauguration ceremony. The artists performed Air and Simple Gifts, newly arranged by John Williams. Yo-Yo Ma and Gabriela Montero were joined by Itzhak Perlman on violin and Anthony McGill on clarinet. Click here to watch.