"Un Monde parfait" ("A Perfect World" in English) is a 2005 song recorded by French young artist Ilona Mitrecey. Based on a traditional Neapolitan song, it was the first single from her debut album Un Monde parfait and was released in February 2005. It was immediately a very big hit in France and Belgium (Wallonia), where it remained for several months atop of the chart, thus becoming one of the biggest-selling singles there. It was also released in many other European countries and achieved success, in Switzerland, Austria, Portugal and Germany where it was a top three hit. It was the best-selling single of the 21st century in France, with 1.5 million copies sold.

In 2004, one year after its recording in France, the single had already been released in Italy, under the name 'Très Bien featuring Ilona'. Originally, it was intended for the Italian dancefloors.

During an interview, Ilona explained that, before "Un Monde parfait", she sang just for fun with her friends. She confided that she recorded "Un Monde parfait" completely by chance and she did that only for play. Her father's society had asked whether she could sing this song from Italy. As she had already sung for some advertisements, she accepted, saying to herself that it could be funny to try.

The French charts specialist Elia Habib explains that this song "mixes an involving sonority resembling Daddy DJ with a text in the spirit of a nursery rhyme". It created "the major surprise of the beginning of spring 2005".

The music video is computer-animated and shows a little girl who will feature in all the other videoclips of the singles from the album Un Monde parfait. Ilona features only in the first seconds. She explained that the producers had decided to make most of the video a cartoon because it tallied well with the lyrics and that would preserve her anonymity.

Ilona says in this song that when she starts to draw, she imagines a perfect world populated of technicolor flowers and animals. Six of these animals also appear in Ilona's all other music videos and on every cover of the singles from Un Monde parfait.

In France, the single went immediately to number two on 27 February 2005 and was number one the following week, and kept this position for 15 weeks. It remained on the top ten for 28 weeks and on the top 100 for 41 weeks, so it was the longest single running in the French singles chart in 2005. It was the best selling single that year and was certified Diamond disc by Syndicat National de l'Édition Phonographique. According to the Infodisc Website, the single is the 12th best selling single of all time in France, with over 1,5 million sales. According to author and expert of French charts Elia Habib, Ilona, who was 11 years old in 2005, remains "the first native of the Nineties to reach number one of the [French Singles Chart]. Through her age, she now appears in Record books, [because she is] the second youngest artist to peak at the top position, behind Jordy (four years old)". "Un Monde parfait" was cited as the most lucrative song of 2006 at the time of a conference given by the SACEM. The song eventually became the best best-selling single of the 21st century in France, with 1,500,000 units sold.

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