For the album, each serial's incidental music was reassembled into short "suites" and although most of the music had been recorded in mono it was, for this compilation, remixed into stereo with sound effects added on to some tracks. The album was re-released in 1992 by Silva Screen records as Earthshock - Classic Music From The BBC Radiophonic Workshop Volume 1, with bonus tracks including "The Worlds of Doctor Who", a track recorded by Mills as a B-side to Dudley Simpson's 1973 "Moonbase 3" single, which featured a mix of music with sound effects from Planet of the Daleks before following with Simpson's "Master's Theme" and finishing with music from the serial The Mind of Evil .
For the album, each serial's incidental music was reassembled into short "suites" and although most of the music had been recorded in mono it was, for this compilation, remixed into stereo with sound effects added on to some tracks. The album was rereleased in 1992 by Silva Screen records as Earthshock - Classic Music From The BBC Radiophonic Workshop Volume 1, with bonus tracks including "The Worlds of Doctor Who", a track recorded by Mills as a B-side to Dudley Simpson's 1973 "Moonbase 3" single, which featured a mix of music with sound effects from Planet of the Daleks before following with Simpson's "Master's Theme" and finishing with music from the serial The Mind of Evil.