Guy Theodore Sebastian is an Australian singer-songwriter who rose to fame after winning the first season of Australian Idol, in 2003. Sebastian has since released ten top ten albums, including three number ones. The first seven all gained either platinum or multi-platinum certification. He has also achieved twenty three top twenty singles, with fourteen of them, reaching the top ten, including six number ones. He is the only Australian male artist in Australian chart history to achieve six number one singles, and places third overall for all Australian acts. Ten of his singles have been certified multi-platinum, including the 13× platinum "Battle Scars". His debut single "Angels Brought Me Here" was the highest selling song in Australia in the decade 2000 to 2009. With 69 platinum and seven gold certifications and combined album and single sales of over five million in Australia, he has the highest certifications and sales of any Australian Idol contestant.

The first season of Australian Idol was produced by Fremantle Media subsidiary Grundy Television in association with UK company 19TV, and was broadcast on Network Ten for 19 weeks in the latter half of 2003. The judges were Mark Holden, Marcia Hines and Ian "Dicko" Dickson.