Article: On 11 April 2006, Brian May and Roger Taylor appeared on the American singing contest television show American Idol. Each contestant was required to sing a Queen song during that week of the competition. Songs which appeared on the show included "Bohemian Rhapsody", "Fat Bottomed Girls", "The Show Must Go On", "Who Wants to Live Forever", and "Innuendo". Brian May later criticised the show for editing specific scenes, one of which made the group's time with contestant Ace Young look negative, despite it being the opposite. Taylor and May again appeared on the American Idol season 8 finale in May 2009, performing "We Are the Champions" with finalists Adam Lambert and Kris Allen. On 15 November 2009, Brian May and Roger Taylor appeared on the singing contest television show X Factor in the UK.

Question: What month and year was the season  finale of American Idol?
May 2009