what song plays at the start of the chapter on Phillipe Petit?
the acrobat.
its like a piano solo at first with the rest of the orchestra coming in
The song is called Perpetuum Mobile; the composer, Brian Keane, has the entire score streaming on his website at http://www.briankeanemusic.com/audio/soundtracks/newyork/index.html
It is track 55.
Cheers!