Controlled first by the Russian Empire and then the Soviet Union, Kazakhstan's folk and classical traditions became connected with ethnic Russian music and Western European music. Prior to the 20th century, Kazakh folk music was collected and studied by ethnographic research teams including composers, music critics and musicologists. In the first part of the 19th century, Kazakh music was transcribed in linear notation. Some composers of this era set Kazakh folk songs to Russian-style European classical music.