Switzerland was represented at the Eurovision Song Contest 1957 with the song "", composed by Géo Voumard, with lyrics by ÃÂmile Gardaz, and performed by Lys Assia. The Swiss participating broadcaster, the Swiss Broadcasting Corporation (SRG SSR), selected its entry through a national final. Assia had already represented Switzerland at the performing both Swiss entries, and winning with "".
=== === The Swiss Broadcasting Corporation (SRG SSR) held a national final to select its entry for the Eurovision Song Contest 1957. Songwriters who applied for the selection were required to have Swiss citizenship or to have been residing in Switzerland for at least ten years and could submit up to three songs. SRG SSR opened a submission window in autumn 1956, with the deadline on 5 January 1957. The broadcaster received 109 songs (69 in German, 22 in French, and 18 in Italian) from 75 songwriters.
The internal jury in Bern were tasked with choosing at most twenty songs and ultimately selected eleven songs to compete in the selection.
The national final, entitled Internationaler Schlagerwettbewerb 1957, was held on 11 February 1957 at 21:00 CET (20:00 UTC) at the Embassysaal in Badrutt's Palace Hotel, St. Moritz. It was broadcast on German- and French-speaking Swiss Television as well as on the radio stations Beromünster, Sottens, and Monte Ceneri. The director was Franco Marazzi. The program was presented by Heidi Abel in German and French, and by in Italian. The artists were accompanied by RSI's orchestra Radiosa under the musical direction of Fernando Paggi. The eleven entries were performed by Lys Assia, Jo Roland and Gianni Ferraresi, with Lys Assia performing five songs, Jo Roland three, and Gianni Ferraresi also three songs. Three entries were sung in German, four in French, and four in Italian. The running order was decided by a draw. The overall sound and image quality of the broadcast was so low that three songs had to be repeated upon the request of the jury of St. Moritz. Los Paraguayos performed as the interval act.
Four regional juries, located in Basel (representing radio Beromünster), Geneva (for radio Sottens), Lugano (for radio Monte Ceneri), and St. Moritz (representing Swiss Television), decided the winner. Each jury consisted of ten members, with each jury member giving one vote to their favourite song. The jury members from St. Mortiz were present within the location of the final, while the remaining juries delivered their votes in their respective cities. The ten jurors from Geneva consisted of Marius Berthet (jury president), Jean-Pierre Allenbach, Robert Burnier, , Jo Excoffier, Frank Guibat, Lisette Martin, Robert Pibouleau, Clairette Sacchi, and Julien-François Zbinden. In the Luganese jury, Bruno Pagnamenta was the jury president. The juries gave their votes via telephone.
Following the voting, three songs tied for first place with 8 votes each: "" and "", sung by Jo Roland, and "", performed by Lys Assia. After all three songs had been performed once more, a revote of the tying entries took place to decide the winner. The winner was the song "", composed by Géo Voumard, with lyrics by ÃÂmile Gardaz, arranged by Mario Robbiani, and performed by Lys Assia. The songwriters Gardaz and Voumard had already won both the national final and the Eurovision Song Contest for , in both occasions also with Lys Assia as singer.
Studio recordings of all competing entries have been preserved in the Swiss National Sound Archives.
At the Eurovision Song Contest 1957 in Frankfurt, the Swiss entry was performed tenth and last in the running order, following . The Swiss entry was conducted at the contest by the event's musical director Willy Berking. At the close of voting, Switzerland had received five votes in total; the country finished shared eight among the ten participants.
The contest was broadcast in Switzerland on French-speaking TSR with commentary by Robert Beauvais, on German-speaking television, as well as on radio Beromünster and Sottens. Excerpts were broadcast on 11 March 1957 at 20:00 CET on the second program of radio Monte Ceneri.
Each participating broadcaster assembled a ten-member jury panel. Every jury member could give one vote to their favourite song.