The stages are set for Saturday's Sound Relief bushfire benefit concerts in Sydney and Melbourne. Developments behind the scenes continue apace for the historic live events taking place in Australia's two biggest cities.

National youth radio station Triple J has pledged to capture the audio from both concerts to transmit and make it available free for radio networks to broadcast throughout the day.

The state-run network, a division of the Australian Broadcasting Corporation, is sharing the content with media networks DMG radio, ARN, Macquarie Regional Radioworks, Austereo. Triple J said today it will also deliver the audio on XYZnetwork' Channel V and MAX pay-TV channels which, as previously reported, will broadcast live the Melbourne Cricket Ground and Sydney Cricket Ground concerts, respectively.

With the audio and broadcast elements in place, high quality recordings to mark the occasion will be in the can by the end of the night. It is virtually a given that the groundbreaking live events should later appear as a DVD release. But at time of writing, the teams organizing both extravaganzas had yet to approach artists to sign away the necessary rights.

"Who knows? But it would be great if something like that can happen due to the very special moments that are going to take place," says promoter Joe Segreto, one of the chief organizers of the Sydney leg. "These bands have been very generous, and we want to make this a once in a lifetime event," he continues.

Speculation is swirling that MySpace could come on board with streaming support, and perhaps a local free-to-air TV would beam a package from the event. Neither party's participation could be confirmed.

While partnership wrangling might well continue until the 11th hour, the line-up and running times have been effectively pencilled in. Rockers Jet will be first up on the MCG stage at 12.10pm, while Coldplay will open the Sydney show at 12.15pm. Midnight Oil and Barry Gibb will draw curtains on the respective Melbourne and Sydney concerts after 10pm.

Rumors abound that Olivia Newton-John will accompany the Bee Gee on stage. Another tip doing the rounds down under has John Farnham teaming with Coldplay on stage. Adding fuel to the fire is the fact Coldplay frontman Chris Martin has been dropped lines from Farnham's global 1980s hit "The Voice" during the British band's current Australian arena tour.

With the production schedule firming up, Michael Gudinski's team earlier on Thursday opened up 1,000 extra tickets for the sold-out Melbourne concert, bringing the stadium's capacity to about 79,000.

The MCG leg, organized by the Frontier Touring managing director and his team, has already entered the history books as Australia's biggest ticketed concert event.

All profits from the MCG show will be donated to help rebuild communities shattered by bush fires in the state of Victoria. Cash raised from the Sydney concert will be split 50/50 between the Red Cross Victorian Bushfire Appeal and the Premier's Disaster relief Fund Appeal in support of victims of the floods in the state of Queensland.

"We're doing whatever we can to raise as much as we can," admits Segreto. "But it's not just about raising an incredible amount of money, but to show that we actually do care, that we do give a shit."