After weeks of voting, the Australian people have chosen the top three contenders to take their shot at the crown on Sunday and one of them is proud Thanakwith (Aboriginal) and Wagadagam (Torres Strait Islander) man Royston Sagigi-Baira.

The 24 year-old made his voice heard in the auditions, performing his breathtaking rendition of 'I'm not the only one' by Sam Smith.

After his audition, the airways were buzzing and it became quite clear that Royston was on his way to the top, blowing the country away with performances.

Following his stellar performance of 'I won't let you go' by James Morrison last week, Mr Sagigi-Baira shared a touching Instagram post detailing his early life and how much he has achieved and overcome.

"To think that little boy from a small Indigenous community in Far North Queensland that used to get bullied for singing and was so shy to sing in front of anyone because if it," Mr Sagigi-Baira said.

"Dreaming in his room and only had movies to dream big about made it to the top six of Australian Idol.

"I wish I could tell him what he's gonna do in the future and see his face expressions! Can't believe this. Thank you so much everyone."

Week by week, Mr Sagigi-Baira has made it through each challenge which has landed him in the Grand Finale this Sunday.

For Royston to have the best chances at bringing the crown home he needs as many votes as possible.

Viewers and supporters can do so until Sunday by texting ROYSTON to 0457 500 700.

If Royston is successful, he will join Casey Donovon as the only two First Nations artists to win Australian Idol. Though the impacts of past contestants like Jessica Mauboy, who was the runner up to Damien Leith in 2005, have been significant.

The winner of Australian Idol will receive a recording contract with industry giant Sony Music and $100,000 in prize money.

Superstars Jessica Mauboy and Harry Connick Jr will also perform on Sunday's broadcast.