Baccara were one of the most internationally famous acts ever to appear at Eurovision, being already known throughout Europe from two recent hugely successful singles, "Yes Sir, I Can Boogie" (which had spent a week at the top of the UK Singles Chart in late 1977) and "Sorry, I'm a Lady". "Parlez-vous français?" was written by Frank Dostal, who had also penned the duo's previous recordings. There was some degree of facetious comment that so similar was it to the two hits that it should have been called "Yes Sir, I'm a Lady". However Baccara were to find (as had Silver Convention the year before) that being a big name act did not necessarily translate into Eurovision success.
On the night of the final Baccara performed 17th in the running order, following Denmark and preceding eventual contest winners Israel. Clad in their trademark colours – María entirely in white and Mayte entirely in black – they gave what is generally agreed to be the most slick and professional performance of the evening in a contest with an unusually high ratio of sub-par vocal performances and inferior stage presentations. However "Parlez-vous français?" was never in contention for victory and finished the evening with 73 points, placing Luxembourg 7th of the 20 entries. The song had received maximum 12s from Italy, Portugal and (unsurprisingly) Spain, but had been ignored completely by seven other national juries. The Luxembourgian jury awarded its 12 points to Israel.