DESCRIPTION:
The 2006 Bridge School Benefit took place on October 21 and 22, 2006, at the Shoreline Amphitheatre in Mountain View, CA. These concerts were unique in that they were the first (and so far only) solo acoustic concerts for Trent Reznor. He was backed by a string quartet, playing a selection of Nine Inch Nails songs, including instrumental pieces.

source: http://www.ninwiki.com/Bridge_School_Benefit