When Did Imogen Holst Die?

Imogen Clare Holst was a British composer, arranger, conductor, teacher, musicologist and festival administrator. The only child of the composer Gustav Holst, she is particularly known for her educational work at Dartington Hall in the 1940s, and for her 20 years as joint artistic director of the Aldeburgh Festival. In addition to composing music, she wrote composer biographies, much educational material and several books on the life and works of her father.