I saw The Jam quite a few times before they finally split up, but there was one moment in their live set when the whole show came together. The entire audience would be on their toes for the extended outro of Set the House Ablaze (about three-and-a-half minutes into this clip). This video doesn't do justice to my memories of a night at the Granby Hall in Leicester during (I think) the Sound Effects tour. If I could re-live any moment at any gig I've ever been to, it would have been that one.
And - on the subject of The Jam, wasn't Happy Together their most overlooked tune? I think so.
And while we're on the subject of early 1980s high-points, surely there has never been a better pop video than this one?