Organum is David Jackman, a British musician and visual artist. He is an elusive but significant figure in UK and international underground music with his extensive catalogue of intense 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