Question: Which country participated in the Eurovision Song contest in 1957 but absent in 1970 and submitted the song co-written by Sebastian F. Ovens?

Context articles: Denmark in the Eurovision Song Contest
Australia in the Eurovision Song Contest 2015
Kids Jury in the Junior Eurovision Song Contest
Portugal in the Junior Eurovision Song Contest
Junior Eurovision Song Contest 2013
Denmark in the Eurovision Song Contest 2016
Bulgaria in the Eurovision Song Contest 2016
Israel in the Junior Eurovision Song Contest
Junior Eurovision Song Contest 2015
Soldiers of Love (Lighthouse X song)

Denmark has participated in the Eurovision Song Contest 46 times since its debut in 1957.
 Having competed in ten consecutive contests until 1966, Denmark was absent for eleven consecutive contests from 1967-1977.
 Since 1978, they have been absent from only four contests.
 Denmark has won the contest three times.
 The Danish qualifying competition for the contest is the Dansk Melodi Grand Prix.
Australia participated in the Eurovision Song Contest 2015 in Vienna, Austria.
 Owing to its cultural and political ties to European countries, the Eurovision Song Contest has been televised in Australia by the public broadcaster SBS for over thirty years.
 In honour of the contest's 60th running and in recognition of the event's popularity in Australia, it was announced on 10 February 2015 that Australia was to be invited to compete in the 2015 contest as a special guest participant.
 Australians have participated in and even won Eurovision as representatives of other countries.
 In 2015 for example, the Australian coloratura soprano of Armenian descent Mary-Jean O'Doherty participated in the Eurovision Song Contest 2015 contest as part of the group Genealogy representing Armenia.
 But this marked the first time that the country has officially participated.
The use of a Kids' Jury in the Junior Eurovision Song Contest was first introduced at the Junior Eurovision Song Contest 2012, in Amsterdam, Netherlands, as part of a new voting system for the Junior Eurovision Song Contest following discussions between the European Broadcasting Union (EBU), KidsRights Foundation, and the Junior Eurovision Song Contest 2012 host broadcaster Algemene Vereniging Radio Omroep (AVRO).
 Three of the four spokespersons who announced the jury points at each annual contest were former winners of the Junior Eurovision Song Contest.
 As of 2016, the results of each country's Kids' Jury have been integrated with the adult jury to give out two sets of 1-8, 10, and 12 points per country.
The participation of Portugal in the Junior Eurovision Song Contest first began at the Junior Eurovision Song Contest in 2006 which took place in Bucharest, Romania.
 Rádio e Televisão de Portugal (RTP), a member of the European Broadcasting Union (EBU), were responsible for the selection process of their participation.
 Portugal used a national selection format, broadcasting a show entitled ""Festival da Canção Junior"", for their participation at the contests.
 This was a junior version of Festival da Canção, the national music competition organised by broadcaster RTP to choose the Portuguese entry for the Eurovision Song Contest.
 The first representative to participate for the nation at the 2006 contest was Pedro Madeira with the song "Deixa-me sentir", which finished in second-last place out of fifteen participating entries, achieving a score of twenty-two points.
 Portugal withdrew from competing in the Junior Eurovision Song Contest in 2008, and will return for the Junior Eurovision Song Contest 2017 in Tbilisi, Georgia.
The Junior Eurovision Song Contest 2013 was the 11th annual Junior Eurovision Song Contest.
 It took place in Kiev, Ukraine on 30 November 2013.
 The venue for the contest was announced on 10 April 2013, as the Palace "Ukraine".
 Ukrainian broadcaster National Television Company of Ukraine (NTU) was the host broadcaster for the event.
 It was the second time the contest was held in Kiev, the first being the 2009 contest .
 It was also the second time in the history of the Junior Eurovision Song Contest that the event took place in last year's winning country, as well as the first time that the event was held in the same city twice.
 A total of twelve countries participated, with Macedonia and Malta making a return, and Albania , Belgium and Israel choosing to withdraw.
 San Marino made their debut in the contest.
 Cyprus was originally the thirteenth country to take part but pulled out the last minute.
Denmark participated in the Eurovision Song Contest 2016 with the song "Soldiers of Love" written by Sebastian F. Ovens, Daniel Lund Jørgensen, Katrine Klith Andersen, Søren Bregendal, Johannes Nymark and Martin Skriver.
 The song was performed by the group Lighthouse X.
 The Danish broadcaster DR organised the national final "Dansk Melodi Grand Prix 2016" in order to select the Danish entry for the 2016 contest in Stockholm, Sweden.
 Ten songs competed in a televised show where the winner was selected over two rounds of voting.
 The results of the first round were decided upon through the combination of jury voting and public voting while in the second round, the winner was selected solely by public televoting.
 "Soldiers of Love" performed by Lighthouse X was the winner after gaining 42% of the public vote.
Bulgaria participated in the Eurovision Song Contest 2016 with the song "If Love Was a Crime" written by Borislav Milanov, Sebastian Arman, Joacim Bo Persson and Poli Genova.
 The song was performed by Poli Genova, who had previously represented Bulgaria in the Eurovision Song Contest in 2011 where she failed to qualify to the final with the song "Na inat".
 In November 2015, the Bulgarian broadcaster Bulgarian National Television (BNT) announced that they would be returning to the Eurovision Song Contest after a two-year absence following their withdrawal in 2014 due to financial limitations.
 On 19 February 2016, the broadcaster announced that Poli Genova had been selected to compete at the 2016 contest in Stockholm, Sweden.
 The song that Genova competed with, "If Love Was a Crime", was also internally selected and was presented to the public on 21 March 2016.
The participation of Israel in the Junior Eurovision Song Contest first began in Amsterdam, Netherlands, at the Junior Eurovision Song Contest 2012.
 Israel Broadcasting Authority (IBA) a member organisation of the European Broadcasting Union (EBU) were responsible for the selection process of their participation.
 The only representative to participate for the nation was Kids.il with the song "Let the Music Win", which finished in eighth place out of twelve participating entries, achieving a score of sixty-eight points.
 Israel withdrew from competing in the Junior Eurovision Song Contest in 2013, and also sat out of the 2014 and 2015 contests.
 However, following their success at the 2015 and 2016 Eurovision Song Contests, IBA expressed an interest in making a return to competing at Junior Eurovision.
 It was announced on the 28 September 2016 that Israel would indeed return to the contest in 2016, with their entrant being selected internally.
 As of Junior Eurovision 2016, Israel have awarded the most points to Armenia and the Netherlands , and received the most points from Ukraine .
The Junior Eurovision Song Contest 2015 was the thirteenth annual Junior Eurovision Song Contest, and took place, for the first time, in Bulgaria.
 The Bulgarian national broadcaster BNT was the host broadcaster for the event.
 The final took place on 21 November 2015 and was held at the Arena Armeec in Sofia.
 Poli Genova, a Bulgarian singer and former representative of Bulgaria in the Eurovision Song Contest 2011 and the Eurovision Song Contest 2016, hosted the show.
 A total of seventeen countries participated, with Australia and Ireland making their debuts.
 Albania and Macedonia returned after being absent since the 2012 and 2013 contests, respectively.
 Croatia and Cyprus withdrew after returning in the 2014 edition , while Sweden withdrew for the first time since 2008.
"Soldiers of Love" is a song performed by Danish boyband Lighthouse X.
 The song represented Denmark in the Eurovision Song Contest 2016, and was written by the band along with Sebastian F. Ovens, Daniel Lund Jørgensen, and Katrine Klith Andersen.
 The song was released as a digital download on 8 January 2016 through Little Jig Records.