He is particularly well known for his compositions for the harp, including Sonatina (1969), Prayer (1970), and Divertimento (1976). Natra was born in Bucharest, and he began studying music with Leon Klepper at the Jewish conservatory there in 1942. He began composing at a young age, and his work in 1944 for orchestras, called "March and Chorale", earned him the status of a modernist in Romania. Israel Philharmonic Orchestra performed this work in 1947 under the conducting of Edward Lindenberg. For this work and for the "Divertimento in classic style" from 1943, he received the Enesco prize.