Who sang 21 guns?

Green Day
21 Guns/Artists

Why do they fire a 21-gun salute?

The 21-gun salute, commonly recognized by many nations, is the highest honor rendered. The custom stems from naval tradition, when a warship would signify its lack of hostile intent by firing its cannons out to sea until all ammunition was spent. The 21-gun salute eventually became the international standard.

What was Greendays first hit?

Released as ‘Dookie”s lead single, ‘Longview’ became the band’s first No. 1 hit on the modern rock chart, and served as Green Day’s introduction to most music fans. It also features one of the coolest bass intros in rock history.