Working in the BBC's Radiophonic Workshop, Delia Derbyshire recorded the Doctor Who theme song in 1963 but also came up with a piece of electronica in the late 60s that sounds like it was recorded in the mid-90s.
Ms Derbyshire was well-known for favouring the use of a green metal lampshade as a musical instrument and said she took some of her inspiration from the sound of air raid sirens, which she heard growing up in Coventry in the Second World War.
(via overstated)
Update: Derbyshire arranged and recorded the Doctor Who theme song but didn't write it. Ron Grainer did. (thx, kevin & pete)