This Element explores the life and work of Grazyna Bacewicz (1909-1969), as a composer, violinist, pianist and author. She lived a remarkable life in Poland, navigating the complex world of Polish communist society and Soviet dominance after the Second World War, and brought Polish music to wider European attention. The Element describes the historical context of her life, her major achievements, and the language and development of her compositions, which attracted notable interest in Polish musical life. She wrote a wide range of pieces, making a significant contribution to the string repertoire, with important String Quartets and violin works. In her sixty years she achieved impressive triumphs as a women composer, served the Polish Composers Union and often judged major international competitions.