Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Mgbe Crisp gbasasịrị na 1997, Sia kwagara London, ebe ọ rụrụ dị ka onye na-abụ abụ azụ maka ndị otu Britain Jamiroquai. O nyekwara ndị otu egwu bekee bụ Zero 7 olu na egwu atọ mbụ ha ma soro ha gaa njem. Na Zero 7's 2001 album Simple Things, Sia nyere aka na abụ abụọ: "Destiny" na "Distractions". Otu "Destiny" ruru No. 30 na UK Singles Chart. N'afọ 2004, o nyere olu maka Zero 7 na "Somersault" na "Speed Dial No. 2" (site na album When It Falls). N'afọ 2006, Sia sooro Zero 7 rụkọọ ọrụ ọzọ maka album nke atọ nke otu ahụ, The Garden, yabụ a na-ahụta ya dị ka onye na-abụ abụ "na-abụghị onye isi" nke Zero 7. N'afọ 2000, Sia bịanyere aka na nkwekọrịta ndekọ na Sony Music's sub-label Dance Pool wee wepụta egwu mbụ ya, "Ewere maka Granted", nke ruru No. 10 na UK Singles Chart. N'afọ 2001, ọ wepụtara ọba egwu nke abụọ ya, Healing Is Difficult, nke jikọtara egwu jazz na egwu mkpụrụ obi ma na-atụle okwu Sia na ọnwụ nke ịhụnanya mbụ ya. N'enweghị obi ụtọ na nkwalite nke album ahụ, Sia gbara onye njikwa ya ọkụ, hapụ Sony Music wee banye na Go! Beat, ụlọ ọrụ nke Universal Music Group (UMG). Na APRA Awards nke 2002, Sia meriri na ngalaba Breakthrough Songwriter n'akụkụ Brisbane pop duo Aneiki's Jennifer Waite na Grant Wallis. N'afọ 2004, Sia wepụtara album nke atọ ya, Colour the Small One. Mpempe akwụkwọ ahụ na-eji ngwakọta nke ngwá egwú na nkwado kọmputa na ihe onwunwe ya. Egwú ahụ wepụtara abụ anọ: "Don't Bring Me Down", "Breathe Me", "Where I Belong" na "Numb". "Breathe Me" ruru No. 71 na United Kingdom, No. 19 na Denmark na No. 81 na France. E mere atụmatụ itinye "Where I Belong" na ụda egwu maka ihe nkiri Spider-Man 2; agbanyeghị, n'ihi esemokwu ndekọ ndekọ, ewepụrụ ya na nkeji ikpeazụ. N'enweghị afọ ojuju na ire ahịa Colour the Small One na mgba nke album iji jikọọ na ndị na-ege ntị, Sia kwagara New York City na 2005. N'oge ahụ,  Ajụjụ: kedu ihe dị n'akwụkwọ ndị ọrụ?
a ngwakọta nke ụda akwara na electronic nkwado ka ya ihe onwunwe