The songwriter says the UK regarded ABBA's winning entry as the biggest threat to its own, by Olivia Newton-John.
The international song competition will serve as a trial for large-scale events.
The song, as sung by Lulu, finished last in the vote to select the UK's 1969 entry in the Eurovision Song Contest.
The American Song Contest is reported to be set for a US television debut for the 2021 holiday season.
From a classic performance by ABBA to the political posturing of Jamala, these are the best Eurovision songs in the contest’s history.
The public vote was conducted on the night that the 2020 Eurovision final was due to take place in Rotterdam.
This year's contest was due to take place in Rotterdam after the Netherlands won it in 2019.
The pop icon will now also perform an additional series of shows in February.
In one of the closest competitions in recent years, the battle for top spot was a tight fight between Sweden, the Netherlands, Russia, Switzerland, Italy and North Macedonia.
The event will be broadcast on BBC One between 8pm and 11.40pm (BST) this evening.
Twenty countries have won through the selection heats and join the pre-qualified ‘Big Five’ countries: France, Germany, Italy, Spain and United Kingdom, in addition to this year’s host country Israel.
On the reggae-tinged song, the pair look to what is ahead, celebrate the present and also contemplate the past.
Eurovision 2018 “chose different” this year, handing the win to Israel’s Netta Barzilai.
US television network NBC have officially announced they re broadcasting an amibitious, star-studded two-hour special dedicated to ABBA in December 2018.
France Gall, frequent Serge Gainsbourg collaborator and the 1965 Eurovision Song Contest winner, has died in Paris at the age of 70
