Electrosonic is an album of “Library samples of electronic music for radio, TV and film industry.”
All tracks are credited to Harper/Russe/St George, where

Harper = Don Harper
Li De La Russe = Delia Derbyshire
Nikki St George = Brian Hodgson

In the GLOSPOT1104 sleeve notes, John Cavanagh gives a loving and entertaining portrait of Delia and the circumstances surrounding the album's creation.

Brian Hodgson says:
Don was an Australian mood music composer. ...I felt uncomfortable working with Don. At our first meeting he was pleasant enough, but I just felt he was using Delia and I to do something he couldn't do himself.[... Harper got up my nose a lot, so I really kept out of it as much as I could. ... There were some of my things which I just said to Don "have this" and gave him tracks, but I would say my contribution to it was much less than either Delia or Don's.

According to the Performing Right Society's database, KPM received 50% of the royalties, Harper 25% and Delia and Brian 12.5% each. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.