To get the geopolitical controversy out of the way first: Acclaimed Russian pianist Denis Matsuev says he does not regret signing a document that voiced support for President Vladimir Putin’s position on Russia’s annexation of Crimea. The document, which was published in mid-March on the Web site of Russia’s Ministry of Culture, and which also endorsed Putin’s stance on Ukraine in general, attracted signatures from world-famous conductor Valery Gergiev, Bolshoi Theatre general director Vladimir Urin and other members of Russia’s artistic elite, prompting some dismay within and outside the country. ...