Sia in the Chummervision Song Contest

Sia made their debut at Chummervision for the 2017 contest.

History
For years prior to their debut, the CBU made several attempts to bring Sia to the Chummervision Song Contest. Invitations were continuously declined, with representatives of Sia stating the country was too proud of its music scene to enter Chummervision, and with their own music contest The Sia Factor taking higher priority.

Following W'ree's withdrawal from the 2017 contest due to political conflict, the CBU were determined to recuperate the loss of a Big 4 member by inviting Sia to the contest, a would be 'Big' country. After months of no response to a formal invitation to the contest, their debut was announced unexpectedly a month prior to the contest. They automatically became a Big 5 member and qualified to the final on August 20. Their first entry was announced shortly after as "Reverie" performed by Arca.

Contestants
Table key
 * Winner
 * Second place
 * Third place
 * Last place

Voting history
As of, Sia's voting history is as follows: