Rush at Wembley Arena. Courtesy of crap phonecam.
They were quite good (I think). It was hard to tell due to the Arena's notoriously poor acoustics. Anyone wishing to simulate the experience should put on their favourite album, get a long cardboard tube and insert it in their right ear whilst getting a friend to hum lo bass notes through it to an irregular rhythm, simultaneously shaking a tin can full of broken glass in your left ear. This will give you the full "live at Wembley" effect!