"C'est une belle journée" (English: "It's a Beautiful Day") is a 2001 song recorded by French singer-songwriter Mylène Farmer. It was the second single from her best of Les Mots and was released on 16 April 2002. The song contains melancholy lyrics set to dance music and was illustrated by a cartoon video produced by Farmer's boyfriend. It achieved great success in France where it remained ranked for several months on the top 50.

In February 2002, Universal and Stuffed Monkey decided to release "C'est une belle journée", one of the three unreleased songs from the compilation Les Mots and officially announced it in March. However, due to the huge success of the single "Les Mots", recorded as duet with Seal, the new single was not released until April 2002. The promotional CD single was sent to radio stations on 4 March 2002, then the promotional vinyl on 28 March 2002. There were three versions of the CD single : one is supple, the second is thick, the third is a picture disc.

Several remixes were produced on the three media (CD single, CD maxi, 12" maxi): 'elegie's club remix ', by Blue Planet Corporation, 'such a beautiful day's remix' and 'beauty and bed remix', by StarCity, 'what a souci's remix', by Tom Novy. Another remix was only available on the German Promotional CD single, 'elegie's remix club radio edit', also by Blue Planet Corporation. In 2004, a new remix was made by Devis Head, engineered by Jérôme Devoise at Studio Guillaume Tell, in Paris. Two other maxi CDs were released in Germany and Canada, with the same track listings as the French one, but with a crystal case. The promotional CD contains two white feathers : one on the cover (at the end of the word "journée"), the other inside. The photography was directed by Ellen von Unwerth, and the cover design was made by Henry Neu.

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