Björk Guðmundsdóttir (Icelandic pronunciation: [ˈpjœr̥k ˈkvʏðmʏntsˌtoʊhtɪr]) (born November 21, 1965) known mononymously as Björk (/ˈbjɜrk/) is an Icelandic singer-songwriter, multi-instrumentalist, producer and occasional actress. She initially became known as the lead singer of the alternative rock band the Sugarcubes, whose 1987 single "Birthday" was a hit on US and UK indie stations and a favorite among music critics. Björk began her career as a solo artist in 1993. Her first album, Debut, was rooted in electronic dance music, house, jazz, and trip-hop, and is widely credited as one of the first albums to introduce electronic dance music into mainstream pop. Now in the third decade of her solo career, Björk has developed an eclectic musical style that incorporates aspects of dance, rock, jazz, electronic, classical, and avant-garde music.

Björk has had 30 singles reach the Top 40 on pop charts around the world, with 22 Top 40 hits in the UK (including the Top 10 hits "It's Oh So Quiet" (#4), "Army of Me" (#10), and "Hyperballad" (#8)), 11 in Ireland, eight in Italy, four in France, and two in Australia. Additionally, "Big Time Sensuality", "Hyperballad", and " I Miss You" were number one Dance Hits in the US. Björk's record label, One Little Indian, reported that she had sold more than 15 million albums by 2003, and prior to the release of Biophilia in 2011, media outlets reported that Björk's first six studio albums had sold more than 20 million copies worldwide. In 2013, NME reported that Debut alone had sold 4.7 million copies worldwide.