Stary Olsa performs medieval, Renaissance, and early baroque music from the Grand Duchy of Lithuania and western Europe. They use only period instruments (painstakingly handcrafted from historically accurate materials), such as cistra, Baltic psaltery, shawms, rebec, and Belarusian bagpipe. They sing in Belarusian. The band has been on tour in Europe and the U.S. since early January, and is making a special stop at the U. of I.
You can watch various videos of them performing, at: http://staryolsa.com/en/gallery/video-en.html