U2 have released their new track Invisible online.
The rockers have made the song available as a free download on iTunes, after debuting the track during a Super Bowl commercial last night (February 2).
Invisible aired as part of a Bank of America advertisement for Bono's (RED) campaign, which promotes HIV/AIDS prevention worldwide.
The track, which is taken from the band's forthcoming album, is free on iTunes until February 3 at 11.59pn ET, with Bank of America donating $1 for each download until a figure of $2 million is reached.
Bono previously commented: "Bank of America coming on as a (RED) partner to help the Global Fund's efforts to eliminate AIDS is great news.
"It's the kind of game-changing influence that will not just deliver millions of dollars but raise consciousness and keep public pressure on putting an end to this devastating pandemic which has already taken the lives of 35 million people."
U2's 13th studio album has not yet been given a formal release date, but is expected to arrive later this year.