Documentaries are in vogue. From Man on Wire to the films of Michael Moore they've captured our hearts and our minds. In this week's edition of The Film Programme Francine Stock examines the very latest and very best of the current releases such as Asif Kapadia's much lauded Senna and Jerry Rothwell's subtle account of the family in the age of the sperm bank, Donor Unknown. The BBC's Storyville editor, Nick Fraser, will be paying tribute to two acknowledged masters, the Maysles Brothers, whose work includes the iconic, Gimme Shelter and the beautiful and affecting portrait of down-at-heel American aristocracy, Grey Gardens. And to round things off Charlie Phillips, one of the organisers of the Sheffield Documentary Festival, and the director Emily James discuss crowd funding - a business model that's revolutionising the genre