After "Emotions" failed to achieve the commercial heights of her debut album, Carey's subsequent release was to be marketed as adult contemporary and pop-friendly. "Music Box" was produced by Carey and Afanasieff, and began a songwriting partnership that would extend until 1997's "Butterfly". The album was released on August 31, 1993 to mixed reviews from music critics. Carey's songwriting was derided as clichéd and her vocal performances were described as less emotive and lazier in their delivery. In his review of the album, AllMusic's Ron Wynn concluded: "sometimes excessive spirit is preferable to an absence of passion." In promotion of the album, Carey embarked on her debut tour, a six date concert series, the Music Box Tour. "Music Box"s second single, "Hero", became Carey's eighth chart-topper in the United States and has been recognized as her signature song. Her cover of Badfinger's "Without You" was a commercial breakthrough in Europe, becoming her first number-one single in Germany, Sweden and the United Kingdom. "Music Box" remains Carey's best-seller and one of the best-selling albums of all time, with worldwide sales of over 28 million copies.