It may be Super Bowl Sunday today (Feb. 2), but it's also Super U2 Sunday! To help bank on the huge football audience, the legendary rock band and frontman Bono's charity, RED, teamed up with Bank of America to release a free single "Invisible," and the song will be promoted through a primetime commercial tonight during Super Bowl XLVIII.

Available for free download now on iTunes, $1 for every download (up to $2 million) will go toward RED. The track was supposed to tip off at 6 p.m. but has been available all day Sunday. Fans will only be able to download "Invisible" between now and Monday, Feb. 3, at 11:59 p.m. before it's taken off iTunes.

According to an interview with Bono from USA Today, the track is not the lead single or a promotional track from U2's upcoming 2014 album but rather a "sneak preview to remind people that we exist," as if a Golden Globe win and Oscar nomination wasn't enough.

As mentioned, it's not all about album hype, RED helps to combat HIV and AIDS as a longstanding charity. "We're taking all the energy around the Super Bowl and interest in what U2's doing and flipping it into the fight against HIV AIDS," said Bono.

Watch the U2/Bank of America commercial below:

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