Sia Kate Isobelle Furler (; born 18 December 1975) is an Australian singer-songwriter, record producer and music video director. She started her career as a singer in the local Adelaide acid jazz band Crisp in the mid-1990s. In 1997, when Crisp disbanded, she released her debut studio album titled OnlySee in Australia. She then moved to London, England, and provided lead vocals for the British duo Zero 7.

After Crisp disbanded in 1997, Sia moved to London, where she performed as a background vocalist for British band Jamiroquai. She also provided lead vocals for English downtempo group Zero 7 on their first three studio albums and toured with the group. On Zero 7's 2001 album Simple Things, Sia contributed vocals to two tracks: "Destiny" and "Distractions." The single "Destiny" peaked at No. 30 on the UK Singles Chart. In 2004, she provided vocals for Zero 7 on "Somersault" and "Speed Dial No. 2" (from the album When It Falls). In 2006, Sia again collaborated with Zero 7 for the group's third album, The Garden and hence she is regarded as the "unofficial" lead singer of Zero 7.  In 2000, Sia signed a recording contract with Sony Music's sub-label Dance Pool and released her first single, "Taken for Granted", which peaked at No. 10 on the UK Singles Chart. In 2001, she released her second solo album, Healing Is Difficult, which blends retro jazz and soul music and lyrically discusses Sia's dealing with the death of her first love affair. Displeased with the promotion of the album, Sia fired her manager, left Sony Music and signed with Go! Beat, a subsidiary of Universal Music Group (UMG). At the APRA Awards of 2002, Sia won the Breakthrough Songwriter category alongside Brisbane pop duo Aneiki's Jennifer Waite and Grant Wallis.  In 2004, Sia released her third studio album, Colour the Small One. The album employs a mixture of acoustic instruments and electronic backing to her material. The album spawned four singles: "Don't Bring Me Down", "Breathe Me", "Where I Belong" and "Numb". "Breathe Me" peaked at No. 71 in the United Kingdom, No. 19 in Denmark and No. 81 in France. "Where I Belong" was scheduled to be included on the soundtrack for the film Spider-Man 2; however, owing to a record label conflict, it was withdrawn at the last minute.  Dissatisfied with Colour the Small One's being poorly marketed and struggling to connect with a mainstream audience, Sia relocated to New York City in 2005. During that time, "Breathe Me" appeared in the final scene of the U.S. HBO television series Six Feet Under, which helped increase Sia's fame in the United States. Consequently, Sia's manager, David Enthoven, set up a tour across the country to maintain her career.

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