The Rainbow World Tour was a concert tour in 2000 by American singer-songwriter Mariah Carey, and supports her seventh studio album Rainbow (1999). The trek started in Europe on February 14, in Antwerp, Belgium, also an itinerary that included North America and ended on April 18, in Toronto. The tour's nine-date North American leg grossed $7.1 million according to Billboard.
The Rainbow Tour marked Carey's first tour in the U.S. in seven years since her 1993 Music Box Tour garnered a flurry of bad initial reviews. In addition to visiting more European countries, Carey also visited Singapore for the first time. During this tour, Carey debuted new songs from the Rainbow album such as: "Can't Take That Away (Mariah's Theme)", "Heartbreaker", "Thank God I Found You" and much more, including some of her biggest hits. Once again, longtime friend Trey Lorenz was featured as a backup singer. On tour merchandise shirts, a date in Dallas, Texas is listed, but was never actually scheduleThe following set list is from the February 17 concert in Milan. It is not intended to represent all dates throughout the tour.[5]

"Mariah & Bianca" (Introduction) (contains elements of "Rainbow (Interlude)" and "Butterfly")
"Emotions"
"My All"
"Dreamlover"
"X-Girlfriend"
"Vulnerability" (Video interlude)
"Against All Odds (Take a Look At Me Now)"
"Without You"
"Make It Happen"
"Thank God I Found You" (performed with Trey Lorenz) (contains elements of the Make It Last Remix)
"Make You Happy" (Interlude) (performed by Trey Lorenz)
"Fantasy" (Bad Boy Remix)
"Always Be My Baby"
"Crybaby"
"Close My Eyes"
"Petals"
"Can't Take That Away (Mariah's Theme)"
"Money Ain't a Thang" (Dance Interlude)
"Heartbreaker" (contains elements of the Desert Storm Remix)
"Honey" (contains elements of the Bad Boy Remix)
"Vision of Love"
"Rainbow" (Interlude)
"Hero"
"Butterfly Reprise" (Outro)