Answer: Advance Australia Fair
Notes: The official national anthem of Australia is "Advance Australia Fair," which was officially adopted on 19th April 1984. The melody and lyrics of this anthem were composed by Peter Dodds McCormick under the pseudonym "Amicus" in 1878. It replaced "God Save the Queen," which is now used as a royal anthem honoring the reigning monarch. "Waltzing Matilda," though widely recognized, stays an unofficial anthem emblematic of Australian culture and history.
