U2 are releasing a song for free in order to raise money for the Aids awareness campaign, (RED).

The Irish rockers' will debut their new song, Invisible, in a commercial for the charity set to air during the Super Bowl telecast in America on 2 February (14).

The track will then be available for free via iTunes, and for every download during that period, Bank of America will donate $1 to (RED) up to a maximum of $2 million (?1.2 million), which will benefit the Global Fund To Fight Aids, Tuberculosis And Malaria.

Frontman Bono helped found the charity in 2006.

He and his partners have raised more than $241 million (?145 million) for the fund, which provides life-saving treatments to millions of people in poor countries.

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