The Lumineers, Little Mix, Dann Pursey (percussion), Paul Gendler (guitar), Chris Laws (drums), James Newman (background vocal), Steve Mac (keyboards), Camille Purcell (background vocal), Kelly Clarkson, Colbie Caillat feat. Aloe Blacc, Colbie Caillat, Aloe Blacc, Fleur East (vocal), Adam Wakeman (organ), Zack The Lad (programmer), Carlos Sosa (saxophone), Raul Vallejo (trombone), Paul Armstrong (trumpet), Ash Soan (drums), Fraser T Smith (keyboards), Fraser T Smith (guitar), Ina Wroldsen (vocal), Benj Miller (bass guitar), Benj Miller (keyboards), Janée Bennett (vocal), Benj Miller (programmer), Moscow Symphony Orchestra, Pitbull feat. Flo Rida & LunchMoney Lewis, Pitbull, LunchMoney Lewis, Flo Rida, The Cali-trievers (background vocal), Leo Soul, DNCE, Gwen Stefani, Jacob Luttrell, Jason Eskridge, Charles Jones, KT Tunstall
