While not always present, it is a common and meaningful addition to many ceremonies, especially in Australia. The didgeridoo is an Indigenous Australian instrument that symbolizes the ancient land and the resilience of the Aboriginal people. It's a reminder of the deep connection Australians have with their land, which is particularly poignant during ceremonies honoring those who served and sacrificed for their country.
Other instruments are also sometimes played, like the bugle for the Last Post and Reveille, but the didgeridoo is particularly symbolic of the ANZAC spirit.