U2 is giving away their latest single "Invisible" absolutely free on iTunes until 11:59 PM EST on Monday, February 3, 2014. Even if you're not a fan, the download is worth a click. Bank of America will donate $1 to (RED) for each download, the iTunes page explains. Bank of America will contribute up to $8 million to the Global Fund to Fight AIDS, Tuberculosis and Malaria -- the charitable recipient for (RED).