I just saw this HP Touchsmart commercial from last year on an old Tivo’d program. It has lovely special effects of a man conducting and gesturing his way through documents and other files, set to Vivaldi’s Four Seasons (Summer). According to Youtube comments, which are of course suspect, the conductor/actor is Philip White (the one listed on IMDB perhaps; another guy didn’t fit the bill). The music is performed by Sejong, which is, perhaps ironically, a string orchestra that does not use a conductor.