Take That, Rihanna and Plan B's performances at the Brits will be put online to download, with artists waiving profits for charity.
Acts such as Arcade Fire, Adele and Cee Lo Green will play the show, which is being broadcast live on ITV1.
All the performances will then be available to buy at www.itunes.com/brits directly after the show.
Last year just Dizzee Rascal and Florence And The Machine's collaboration You Got The Dirtee Love was made available. It rocketed into the official charts at number two by the end of the week.
Brits bosses said that each of the artists' proceeds will be going to the Awards' charity partner, The Brits Trust.
Other artists due to play at tonight's event at the O2 Arena in London include Tinie Tempah and Mumford and Sons.