Search: twenty-one guns song
Why: I just heard it. It sounded like Green Day.
Answer: "21 Guns" by Green Day, from their new album 21st Century Breakdown.
The chorus goes:
One, 21 gunsIt sounds like this:
Lay down your arms
Give up the fight
One, 21 guns
Throw up your arms into the sky,
You and I
Source: 104.3MyFM (Adult Contemporary Radio, ya herd)
The More You Know: Like their 2004 album American Idiot, 21st Century Breakdown is a rock opera. It is divided into 3 acts: "Heroes and Cons," "Charlatans and Saints," and "Horseshoes and Handgrenades." Also, I just remembered they played this song on SNL like 3 weeks ago.