Conductor Risto Joost and soprano Iris Oja, left, rehearse the operetta "Nostra Culpa" in Tallinn, Estonia, Thursday, April 4, 2013. Inspired by a lively social media exchange between Estonian President Toomas Hendrik Ilves and Nobel Prize-winning economist Paul Krugman, the two expats, composer Eugene Birman and Scott Diel, who wrote the lyrics, have composed an operetta that soars across the merits and pitfalls of austerity _ an ever more prominent reality in Europe’s struggling economy. (AP Photo/Liis Treimann)

Associated Press
Conductor Risto Joost and soprano Iris Oja, left, rehearse the operetta "Nostra Culpa" in Tallinn, Estonia, Thursday, April 4, 2013. Inspired by a lively social media exchange between Estonian President Toomas Hendrik Ilves and Nobel Prize-winning economist Paul Krugman, the two expats, composer Eugene Birman and Scott Diel, who wrote the lyrics, have composed an operetta that soars across the merits and pitfalls of austerity _ an ever more prominent reality in Europe’s struggling economy. (AP Photo/Liis Treimann)
Conductor Risto Joost and soprano Iris Oja, left, rehearse the operetta "Nostra Culpa" in Tallinn, Estonia, Thursday, April 4, 2013. Inspired by a lively social media exchange between Estonian President Toomas Hendrik Ilves and Nobel Prize-winning economist Paul Krugman, the two expats, composer Eugene Birman and Scott Diel, who wrote the lyrics, have composed an operetta that soars across the merits and pitfalls of austerity _ an ever more prominent reality in Europe’s struggling economy. (AP Photo/Liis Treimann)
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