Delia Derbyshire joined up with Brian Hodgson as Unit Delta Plus. In 1968 they got together with David Vorhaus to form The White Noise. In 1969 they released the forward-looking Electric Storm LP which included this track.
As Wikipedia notes:
In June 1969 White Noise released the groundbreaking album An Electric Storm on Island Records. The album was created using a variety of tape manipulation techniques, and used the first British synthesizer, the EMS Synthi VCS3. Amongst many oddities, the first track on the album, Love Without Sound, employed sped-up tape edits of Vorhaus playing the double bass to create violin and cello sounds.
Though not a hit at the time, this album has gone on to influence many artists.
