U2's new song Invisible raised more than £1.9m for (RED) in 36 hours, by being downloaded free by over 3 million people around the world.

For every download Bank of America paid $1 to the Global Fund to fight Aids, TB and Malaria totalling 3,138,470 and surpassing the original pledge of $2m. As a result, Invisible has now been available to purchase on iTunes for 99p with all proceeds going to the Global Fund.

The video for Invisible is directed by Mark Romanek (Never Let Me Go, One Hour Photo) and will be made available later this week. A 60-second segment of the video was shown during the Super Bowl broadcast last Sunday which saw in excess of 1 million people download the track in one hour.

The track was produced by Danger Mouse and mixed by Tom Elmhirst.

The Global Fund provides life-saving HIV/AIDS treatment, testing and prevention services to tens of millions of people in the world's poorest countries. The money raised through the Super Bowl initiative is part of a recently announced two-year, $10 million commitment by Bank of America.

(RED) has already generated more than $250 million for the Global Fund since being founded in 2006 by U2 lead singer Bono and Bobby Shriver in order to drive corporate donations to the fight against AIDS.