After concluding her Butterfly World Tour, Carey partook in the VH1 Divas benefit concert on April 14, 1998, where she sang alongside Aretha Franklin, Celine Dion, Shania Twain, Gloria Estefan, and Carole King. Carey began conceptualizing a film project "All That Glitters", later re-titled to simply "Glitter" (2001), and wrote songs for other projects, such as "Men in Black" (1997) and "How the Grinch Stole Christmas" (2000). After "Glitter" fell into developmental hell, Carey postponed the project, and began writing material for a new album. Sony Music executives insisted she prepare a greatest hits collection in time for the holiday season. The album, titled "#1's" (1998), featured a cover of Brenda K. Starr's "I Still Believe" and a duet with Whitney Houston, "When You Believe", which was included on the soundtrack for "The Prince of Egypt" (1998). "#1's" became a phenomenon in Japan, selling over one million copies in its opening week, making Carey the only international artist to accomplish this feat. It sold over 3.25 million copies in Japan in its first three months on sale, and holds the record as the best-selling album by a non-Asian artist.