The latest in a long line of celebrities and musicians to donate money to bushfire relief is Metallica, who have pledged $750,000 to the NSW Rural Fire Service and the Country Fire Authority in Victoria.

In a series of tweets, the rock legends wrote they were "totally overwhelmed" at the level of destruction wreaked by the fires raging across the country.

“The resulting destruction and devastating effects on all residents, animals, the environment and the incredible land in Australia is truly heartbreaking," they wrote.

“Please join us and do whatever you can to assist as we, along with our @AWMHFoundation, are pledging A$750,000 to the NSW Rural Fire Service and to the Country Fire Authority in Victoria to aid in the relief efforts."

In the video below: Elton John's $1m gift to bushfire victims

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Metallica was scheduled to tour Australia last year, but the shows were cancelled after lead singer James Hetfield was admitted to rehab.

The band has posted a series of tweets informing their fans about the bushfire crisis and what they can do to help.

They have joined other musicians including Elton John, who has pledged $1 million, and Kylie Minogue, who has pledged $500,000, to support firefighting efforts and wildlife rescue.

More on 7NEWS.com.au

Other big-name celebrities to donate include actor Chris Hemsworth and comedian Celeste Barber, while tennis stars Roger Federer and Rafael Nadal are joining forces for a Rally for Relief bushfire fundraiser.