Then we got down to recording the track and we [added] 48 tracks of voices, which had never been done in Abbey Road before, then the whole backing. The Dave Clark Five and Beyond.
It also featured a holographic projection of Sir Laurence Olivier, but was lampooned by critics at the time.
Following the initial sessions, Mercury returned to the studio in January 1986 to record the version of "Time Waits for No One", which was written by Dave Clark and John Christie.
The multi-track, big production song was created for the concept album based on Dave Clark's musical of the same name and released as a single on May 6 that year.
Dave, 76, of The Dave Clark Five band, went on a ten-year hunt for the original rehearsal recording, which sees Freddie singing with just a piano, and he finally discovered the unearthed gem in spring 2018.
Bringing in original keyboardist Mike Moran to record a new piano track, restoring the huge potential of this historical performance at the latter's studio in Buckinghamshire, Dave, firmly believing "the impossible was possible", eventually produced the performance he had longed to revive - stripping back the 96 track version to a version with just one: Freddie Mercury.
"It gave me goosebumps because it's the way he performs it, like he tastes every word".
'It was fabulous - but I still felt there was something about the original rehearsal'.
"A few years later I got my engineer to go down and go through everything, we couldn't find it".
The accompanying video released Thursday was developed from the negatives from a 4-camera shoot and unprocessed film, according to a statement posted on Freddie Mercury's website.
"When we first met he said, "But how can I do this song?' and I said to him, 'I want a cross between Edith Piaf, Jennifer Holliday and Shirley Bassey", Clark says in the interview.
Time Waits For No One is out today on Virgin EMI (Universal Music Group). The clip shines a light on Mercury's "magic performance", featuring the iconic vocalist looking angelic in all white, belting out the song in his signature style fitting for a Broadway stage. "Clark says that Mercury's performance channels legendary vocalists Edith Piaf, Jennifer Holliday and Shirley Bassey".