According to one site I found, the music in the Australia trailer is one of the following:

# The Good, The Bad and The Ugly (1967): "The Ecstasy of Gold" - Ennio Morricone
# Henry V (1989): "St. Crispin's Day" - Patrick Doyle
# "Take the Field" - X-Ray Dog
# Henry V (1989): "The Day is Yours" - Patrick Doyle

Hope it helps