You can watch all sorts of videos, from auditions to snippets of the musicians' arrival in NYC to an hour long "Act One" of the actual Carnegie Hall concert, as introduced by Michael Tilson Thomas at the YouTube Symphony Orchestra Channel. MTT called the three-day event "a classical music summit/conference/scout/jamboree with an element of speed dating thrown in." ☺
The composer of the featured musical work in the concert (Internet Symphony No. 1 "Eroica"), Tan Dun, is also the composer of the music in one of my most-loved films, Crouching Tiger, Hidden Dragon.
Played by the ever-brilliant Yo-Yo Ma on both the movie soundtrack and Classic Yo-Yo. You can hear more here.