 In January 2015, Carey announced that she would re-release # 1's (1998) with an updated version featuring her songs that had in the meantime reached number-one: "Heartbreaker" featuring Jay-Z (1999), "Thank God I Found You" featuring Joe and 98 Degrees (2000), "We Belong Together" (2005), "Don't Forget About Us" (2005 / 06) and "Touch My Body" (2008). The North American track listing of # 1 to Infinity features Carey's eighteen U.S. number-one singles on the Billboard Hot 100 and one new recording called "Infinity". Instead of including the original studio version of her third number-one "Someday" (1991), the live recording from her MTV Unplugged EP (1992) features instead. Carey explains in the liner notes of # 1 to Infinity that she felt the studio version was overproduced. The Bad Boy Fantasy remix of her ninth number-one "Fantasy" featuring Ol' Dirty Bastard was included instead of the original solo version. Carey describes the remix as a "turning point" in her career.
