Final answer:
Isaac Nathan composed the first opera in Australia, establishing a unique tradition in operatic history separate from European composers like Wagner, Verdi, and Strauss II.
Step-by-step explanation:
The first opera to be written and performed in Australia was composed by Isaac Nathan. He was an English composer known for his work during the 18th and 19th centuries. While Richard Wagner is noteworthy for the invention of the orchestra pit to enhance the theatrical magic of the performance, his creations did not mark the beginnings of opera in Australia. Australian opera has its own distinct origins, separate from European influences such as Wagner, Giuseppe Verdi, and Johann Strauss II.