Arvo Pärt (Estonian pronunciation: [ˈɑrvo ˈpært]; born 11 September 1935) is an Estonian composer of classical and religious music. Since the late 1970s, Pärt has worked in a minimalist style that employs his self-invented compositional technique, tintinnabuli. Pärt's music is in part inspired by Gregorian chant. His most performed works include Fratres (1977), Spiegel im Spiegel (1978), and Für Alina (1976). Since 2010 Pärt has been the most performed living composer in the world.