sentences:  In June 2007, Canadian singer-songwriter Chantal Kreviazuk, with whom Lavigne co-wrote the majority of her second album, "Under My Skin", spoke to "Performing Songwriter" magazine about Lavigne's songwriting ability and ethics.Kreviazuk claimed that the song "Contagious" was based on a track she had sent to Lavigne in 2005.On July 6, 2007, Lavigne denied the accusation in an open letter on her website.