Pasage: Mushure mekunge Crisp yaparara muna 1997, Sia akatamira kuLondon, kwaakaita semumiriri wezwi reBritish band Jamiroquai. Akapawo izwi rekutungamira reChirungu pasi-tempo boka reZero 7 pane avo matatu ekutanga maalbum e studio uye akafamba neboka. Pa Zero 7's 2001 album Zvinhu Zvakareruka, Sia akapa izwi kunzira mbiri: "Destiny" uye "Kufungidzira". Iyo imwechete "Destiny" yakasvika paNhamba 30 paUK Singles Chart. Muna 2004, akapa izwi reZero 7 pa "Somersault" uye "Speed Dial No. 2" (kubva pane iyo album When It Falls). Muna 2006, Sia akabatana zvakare neZero 7 yechitatu yeboka reboka, Iyo Bindu reGarden, uye nekudaro anoonekwa seye "unofficial lead singer" weZero 7. Muna 2000, Sia akasaina chibvumirano neSony Music's Zero 7 pazviridzwa zvitatu zvepamusoro uye akafamba neboka.
musanganiswa wezviridzwa zvemanzwi uye kutsigirwa nemagetsi kuzvinhu zvake