The piece is the prelude of Bach's first cello suite. The thirty-five other movements in the Bach cello suites are equally beautiful, but it is mainly this movement that is played.

While my cello playing was originally inspired by Ma's interpretation of the cello suites, I now find his rendition of them a bit insipid. I suggest checking out Pablo Casals' interpretation - he popularized the Bach suites, and the recordings are beautiful. Rostropovich also played them fairly well.

If I had to pick a Bach cello suite movement for such a video, it would be the Sarabande from the 6th suite:

http://www.youtube.com/watch?v=l3dgACCAzwM

Edit: I changed my mind, I would go with the Sarabande from the 1st suite: http://www.youtube.com/watch?v=PvOo0cS8w10