User: Extract the special guests that Taylor Swift had on her 1989 Tour in 2015. Separate them with a comma.
Assistant: Ed Sheeran, Dan Reynolds, Martha Hunt, Gigi Hadid, Little Big Town, Echosmith, Cara Delevingne, Mariska Hargitay, Rachel Platten, Mariska Hargitay, Gigi Hadid, Kendall Jenner, Serena Williams, Martha Hunt, Karlie Kloss, Cara Delevingne, The Weeknd, Heidi Klum, United States women's national soccer team, Lily Aldridge, Lena Dunham, Gigi Hadid, Hailee Steinfeld, Nick Jonas, Gigi Hadid, Martha Hunt, Lily Aldridge, Candice Swanepoel, Behati Prinsloo, Karlie Kloss, Uzo Aduba, Lorde, Jason Derulo, Andy Grammer, Serayah, Sam Hunt, Andreja Pejić, Lily Donaldson, Walk the Moon, MKTO, Nico & Vinz, Fetty Wap, Ciara and Russell Wilson, Fifth Harmony, Little Mix, Joan Baez, Julia Roberts, Ryan Tedder of OneRepublic, Kobe Bryant, Uzo Aduba, Chris Rock, Matt LeBlanc, Sean O'Pry, Mary J. Blige, Natalie Maines of the Dixie Chicks, Ellen DeGeneres, Alanis Morissette, Beck, St. Vincent, John Legend, Selena Gomez, Lisa Kudrow, Justin Timberlake, OMI, Avril Lavigne, Wiz Khalifa, The Band Perry, Sydney Sierota of Echosmith, Dierks Bentley, Kelsea Ballerini, Steven Tyler of Aerosmith, Alison Krauss, Leona Lewis, Mick Jagger of The Rolling Stones, Nelly, Haim, Keith Urban, Charli XCX, Ellie Goulding, Miranda Lambert, Tove Lo, Dwyane Wade, Pitbull, Ricky Martin, Alessia Cara, Idina Menzel