In last Sunday’s Post Magazine, the newspaper’s retiring rock critic David Segal described what he called the “great Live Concert moment.” He wrote:

It’s about music, but it’s also about an experience that’s ephemeral and communal, that you share for a couple of hours with a bunch of strangers who, at some level, you feel like you know because they have the same idiotic glint in their eye when the lights come up. It’s the sense that the whole evening means as much to the band as it does to you. It’s great songs multiplied by killer performance multiplied by giddy fan reaction.

Last night’s performance by Green Day at the Merriweather Post Pavilion may well have been one of those moments.