Zingaresca comprises Oleg Timofeyev and Vadim Kolpakov, two boosters of the Russian seven-string guitar. Kolpakov is a descendent of one of its best-known players, while Timofeyev is a scholar devoted to its legacy. You might wonder, then, why they take one of the final dates of this year's Music of the Carolinas series, which generally explores the more traditional sounds of the region. Last week, the North Carolina Museum of History opened two concurrent exhibits to commemorate the 400th anniversary of the Romanov Dynasty. With their hyperkinetic arrangements for dual guitars, Zingaresca adds another dimension to the host's installations.