Task: Question Answering
Input (English): Passage: The new album was publicised during Jay-Z's performance at the Coachella Valley Music and Arts Festival in April, when a blimp flew across the venue announcing that M.I.A.'s new album would be released on 29 June 2010. M.I.A. promoted the album with a series of appearances at music festivals, including the Hard festival in New York and The Big Chill in Herefordshire. Her performance at the latter was cut short due to a stage invasion by fans. She also performed at the Flow Festival in Finland, where she was joined onstage by Derek E. Miller playing guitar during her performance of "Meds and Feds", and the LokerseFeesten in Lokeren, Flanders, Belgium, where her performance drew a crowd of 13,500, the biggest of the 10-day music festival. In September she announced a tour that would last until the end of the year.M.I.A. also promoted the album with an appearance on the "Late Show with David Letterman", during which she performed "Born Free" with Martin Rev of Suicide playing keyboards, backed by a group of dancers styled to look like M.I.A. In November 2010 she appeared on the British television show Later... with Jools Holland, performing "Born Free" and "It Takes a Muscle", the latter with members of The Specials. While promoting the album, M.I.A. became involved in a dispute with Lynn Hirschberg of The New York Times, who interviewed her in March 2010 and whose resulting article portrayed the singer as pretentious and attention seeking. In response, M.I.A. posted Hirschberg's telephone number on her Twitter page and later uploaded her own audio recording of the interview, highlighting the discrepancies between what she said and what was reported. The piece was criticised for its yellow journalism by some, however M.I.A. received varying degrees of support and criticism for the ensuing fallout from the media. Benjamin Boles wrote in Now that, while Hirschberg's piece came across as a "vicious ... character assassination", M.I.A's subsequent actions were "childish" and made her "the laughing stock of the internet". The paper later printed a correction on the story, acknowledging that some quotes had been taken out of context. The incident prompted Boots Riley of the band Street Sweeper Social Club to comment on how artists had access to media that allowed writers to be held accountable and that M.I.A.'s move was "brilliant". 
Question: What is the name of the person that performed at the Flow Festival in Finland?
Output (English): M.I.A.