Our latest guest on Soundtracking is a screenwriter who's proved extremely adept at adaptations of books, including The Men Who Stare At Goats, The Snowman, The Goldfinch and - the main reason we have him with us on this episode - Tinker Tailor Soldier Spy, the film of which is celebrating its 10th anniversary. Peter Straughan was a delight to spend a little time with as we explored the ways music informs the writing of a script.