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
2 Become 1 the song a "perfect adult contemporary confection". Greg Kot of the "Chicago Tribune" said that their first album "is a compendium of slick secondhand urban pop encompassing [...] G-funk synths on 'Say You'll Be There' [...] and Babyface's guitar and strings balladry on '2 Become 1'". In a review of the group's 2007 compilation album "Greatest Hits", Talia Kraines of BBC Music called it "shimmering" adding that "only a cold heart could fail to love their first festive #1". Digital Spy's Nick Levine said that the group's slower songs were "probably their strongest suit", and thought that "'2 Become 1'