The composer is perhaps either Richard Rodney Bennett (b.  1936) or
Robert Russell Bennett.  If it is the former, there is a bio on him at:

   http://www.schirmer.com/composers/bennett/bio.html

and and available bio-biliography of him at:

   http://info.greenwood.com/books/0313261/0313261792.html

Sorry, I don't know the music. The piece you refer to appears to be
titled Abraham Lincoln/Sights & Sound.

Dick Hihn

 [Richard Rodney is an English composer, I believe, so that leaves Robert
 Russell as the most likely of the two.  -Dave]