Composer Eugene Birman (L) speaks to writer Scott Diel before the premiere of financial opera "Nostra Culpa" (Our Fault) in Tallinn April 7, 2013. Nostra Culpa is a 16-minute musical piece for soprano and string orchestra, based on a twitter spat between Nobel Prize economist Paul Krugman and President of Estonia Toomas Hendrik Ilvess about austerity measures in Estonia. REUTERS/Ints Kalnins (ESTONIA - Tags: ENTERTAINMENT POLITICS BUSINESS SOCIETY)