At twenty months of age he was diagnosed with cystic fibrosis, a genetic condition which affects the lungs, liver, pancreas and intestine.

Sponsored by Sony Music, AB Prod, Radio Scoop and Partouche, the production had ambitious plans to make a provincial tour, before a run at the Le Zénith in Paris.

[6] In 2004, Lemarchal gained international recognition after participating in the fourth season of the French reality singing competition Star Academy.

[3] During his participation in the show, he had the opportunity to perform with French singers such as Yannick Noah, Michel Sardou and Patrick Bruel, and Italian tenor Andrea Bocelli.

[9] A third single, "À corps perdu", was less successful, with major French radio stations refusing to play it on account that it was "too sad".

From May to June 2006, he completed his first solo nationwide tour across France, Belgium and Switzerland; a DVD of his performance, Olympia 06, was subsequently released.

[3][4] His death made news headlines for an entire week, and more than five thousand fans arrived in Chambéry on the day of his funeral to pay their respects.

A special television programme on 4 May 2007, "Grégory: La voix d'un ange", broadcast on TF1 to commemorate his life, reached an audience of more than 10.5 million viewers, and there was an appeal for donations to raise funds to fight cystic fibrosis[12] and help progress research into finding a cure.

[3][13] A posthumous album, La voix d'un ange, was released a month and a half after his death by his record company Universal Music Group France, with profits going towards the Association Grégory Lemarchal.

[21] The success of the single eventually garnered him a posthumous award of Vincent Scotto by SACEM, the Society of Composers, Authors and Music Publishers of Canada.