Billie Joe Armstrong had to get drunk before he could sing 'Good Riddance (Time Of Your Life)' live.

The Green Day rocker admits there are always songs an artist wants to "keep to themselves" but the group's producer insisted they release the track, one of the most personal he had ever written.

He said: "For me, when we did 'Nimrod', which had 'Good Riddance' - that was really the first time we attempted a ballad. The first time we ever played that song was during an encore in New Jersey - I had to pound a beer backstage to get up the courage. I knew we were gonna take a tomato to the face."

Despite their global success, the 'Basket Case' singer admits he hasn't always been comfortable with it because he doesn't want to hold himself back from trying to achieve bigger and better things.

He added to Spin.com: "I was always self-conscious about our success, mostly because I want to keep evolving - I want to keep that thing moving."