Spice Girls discography sold 23 million copies worldwide and was certified ten times platinum by the British Phonographic Industry (BPI) in the UK. The fourth Spice Girls single, the double A-side "Mama"/"Who Do You Think You Are", also went to number one in the UK. In November 1997 the group released their second album, "Spiceworld", which has been certified five times platinum by the BPI. The album produced three number-one singles in the UK, "Spice Up Your Life", "Too Much" and "Viva Forever", with "Stop" peaking at number two, ending the group's run of consecutive number-one singles in the UK. In May 1998
Number 1's (Mariah Carey album) was releasing a collection of her number one singles as a "thank you" and a tribute to her fans, and explained that someday she would release a true greatest hits album containing songs that were not released as singles, as well as singles that did not reach number one. In December 2001, Columbia released the album "Greatest Hits", which featured Carey's number one singles alongside songs she said "needed to be really heard", such as "Underneath the Stars" and "Forever". In an interview with MTV, Carey made the following statement regarding the album: "There's a lot of songs that I'm