Song for a Saturday: Love Without Sound

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.