David Jackman is a British musician and visual artist with an extensive catalogue of drone works, mostly as the principal — and often sole — member of Organum. Jackman's earliest known musical activity was as a member of Cornelius Cardew's Scratch Orchestra between 1969 and 1972. He later spoke highly of the value of his experiences in the ensemble, writing in 1994 that "I joined the orchestra in 1969 and soon found myself thrown into an energetic environment where to my surprise my musical ideas, however tentative, would be taken seriously and would actually get realised". In 1979 he began to release very short runs of cassette singles, in line with the prevailing underground cassette culture. These were almost all released under his given name or the moniker Monoplane. It was not until 1