It is just an excuse for a bunch of old, washed-up drug-heads to get together and show the world that they still have “it”.
If there were only one or two big names no one would watch.
From the look of the crowd (and the bar being set at no songs older than about 1968 but the bulk no more recent than 1984) this is about a bunch of aging New Yawker baby boomers in the AUDIENCE present at MSG trying to tell the world they still have it.