Klezmer (Yiddish: כליזמר or קלעזמער (klezmer), pl.: כליזמרים (klezmorim) – instruments of music) is a musical tradition of the Ashkenazi Jews of Eastern Europe. Played by professional musicians called klezmorim in ensembles known as kapelye, the genre originally consisted largely of dance tunes and instrumental display pieces for weddings and other celebrations. In the United States the genre evolved considerably as Yiddish-speaking Jewish immigrants from Eastern Europe, who arrived between 1880 and 1924, came into contact with American jazz. During the initial years after the klezmer revival of the 1970s, the American sub-variety was what most people knew as klezmer, although in the 21st century musicians began paying more attention to the original pre-jazz traditions as revivalists including Josh Horowitz, Yale Strom and Bob Cohen have spent years doing field research in Eastern/Central Europe. Additionally, later immigrants from the Soviet Union, such as German Goldenshtayn, took their surviving repertoires to the United States and Israel in the 1980s.