Denmark was represented at the Eurovision Song Contest 1957 with the song "", composed by Erik Fiehn, with lyrics by Poul Sørensen, and performed by Birthe Wilke and Gustav Winckler. The Danish participating broadcaster, , organised the in order to select its entry for the contest. This was the first-ever entry from Denmark in the Eurovision Song Contest, and the first-ever entry performed in Danish in the contest.
Statsradiofonien had wanted to take part in the in 1956 but registered too late.
For the Danish selection, established the rules in cooperation with the songwriters associations and . On 3 January 1957, the broadcaster invited these associations as well as the to submit songs for the Danish selection. A call for submission was also published in the press, with the deadline being 28 January 1957. 117 songs were submitted. A jury consisting of Flemming Weis (), Axel Thingsted (), Kai Mortensen () and () chose six of them for the national final.
held its national final titled Melodi Grand Prix at Radiohuset in Copenhagen on 17 February 1957 at 20:20 CET (19:20 UTC). It was broadcast on Statsradiofonien Fjernsyn and also on Program 2. The program was hosted by Sejr Volmer-Sørensen.
The entries were performed by Birthe Wilke and Gustav Winckler. Both performed two songs as soloists and they also performed two songs as a duo. The artists were accompanied by under the direction of Kai Mortensen. The songs were arranged by Arne Lamberth, Poul Clemensen and . An expert jury of ten people watching the show from a separated studio selected the winning song. The jury included , Flemming Weis, Jens Warny, Harald Krebs, Axel Thingsted, Poul Hamburger, Susanne Palsbo, , Kay Rostgaard-Frøhne, and .
Jury president Susanne Palsbo announced the result. The songwriters of the winning song were only revealed at the end of the program. Only the top two were announced, which turned out to be the two duets. "", written by and with lyrics by , was the overall winner and would become the first Danish entry in the Eurovision Song Contest.
"" was recorded and released on an EP of the same title, with the runner-up entry "" also included. After the contest, Gustav Winkler has recorded a German version of the song ("") with Bibi Johns. Winkler himself appeared as Gunnar Winkler on this record.
Denmark was the first Nordic country in the competition. For the Eurovision Song Contest in Frankfurt, the lyrics were shortened in order to fit into the maximum duration of three and a half minutes recommended by the rules. The Danish entry was visually one of the most impressive ones that year: to illustrate the content of the song Winkler was dressed up as a naval captain and Wilke wore a raincoat with a purse in her hand. Furthermore, a tar vat was brought on stage to create a harbour atmosphere. A characteristic of the song is the bass clarinet playing low notes, imitating a ship's foghorn. Additionally, the song is famous for the kiss the duo exchanged at the end of the performance. The kiss lasted longer than planned, due to a stagehand omitting to signal for it to end.
The Danish entry was performed ninth on the night, following and preceding . At the close of voting, Denmark had received ten votes in total, placing the country third among the ten participants.
The contest was televised on and on radio station Program 2, both with commentary by Svend Pedersen.
Every participating broadcaster assembled a jury of ten people. Every jury member could give one vote to his or her favourite song. The Danish jury comprised the same ten members as for the national final.