György Ligeti (1923–2006) was a Hungarian composer of contemporary classical music. He has been described as "one of the most important avant-garde composers in the latter half of the twentieth century" and "one of the most innovative and influential among progressive figures of his time".
Four Early Piano Pieces: Basso Ostinato (1941) is one of the first pieces written by Ligeti; the first is based on a melodic ostinato in the left hand with a popular melody in the right hand influenced by Bartok.