New York (AFP) – Mariah Carey has been sued in the United States for alleged copyright infringement over her global hit 1994 song “All I Want for Christmas Is You,” court documents show. The plaintiff, a musician named Andy Stone, says he co-wrote and recorded a festive song of the same name in 1989 and never gave permission for it to be used. In the suit filed on Friday in Louisiana, Stone alleges that Carey and her co-writer Walter Afanasieff “knowingly, willfully, and intentionally engaged in a campaign to infringe” his copyright. He is seeking damages of $20 million for alleged financial l…