First recorded by Vigrass & Osborne (JPN #2 1972).
Hit version by Justin Hayward (US #47/UK #5 1978).
From the wiki: “‘Forever Autumn’ was written by Jeff Wayne, Gary Osborne and Paul Vigrass. The original melody was composed by Wayne in 1969 as a jingle for a Lego commercial. Vigrass and Osborne, the performers of the original jingle, then, added lyrics and recorded the song for their 1972 album Queues. The recording was also released as a single and gained commercial success in Japan, selling more than 100,000 copies and becoming a Top 5 hit.