Much like the film itself, Mr. Iglesias's music for Tomas Alfredson's "Tinker Tailor Soldier Spy" is understated.

WSJ: Who Will Win the Oscar for Best Score? | By Jim Fusilli

Tomas Alfredson, who made his name with the hauntingly good vampire film Let The Right One In (2008), sat Oldman down and opened a page in le Carre's book.

BBC: Gary Oldman's Smiley: 'A little sexier, a little crueller'