1972 !
OK, this was classic. Into the first verse of the song... he forgets to sing the first half of the first verse and then you can see that look on his face as he recovers... then in the background.. you can see Jerry Garcia give a knowing smirk... it was kind of an awsome moment. The recovery was just perfect anyways.
The complete verse was
"Arrows of neon and flashing marquese out on main street...
CHicago, New York , Detroit and its all on the same street...
Your typical city involved in a typical day dream,... hang it up and see what Tomorrow brings"
so he just spaced the first line