He continued to appear sporadically throughout 2005, with his workload increasing as the tour progressed.

In recent years, Plant has reflected on the negative dynamics which increasingly became evident as the 1977 tour progressed:

As the tour progressed, Young got more and more into making the encore section a full-on stage act.

As the tour progresses a throaty laugh comes to the fore, even a cackle.

The tour progressed past a large flat-screen television on the wall projecting a map of the United States.

From there the tour progressed to multiple venues in Sweden.

Critical response also improved as the tour progressed.

The tour progressed to Japan and then to South America.

As the tour progressed into 2002, the band received more positive reviews from critics.

And as the tour progressed today, it was apparent that most of the $5.5 billion invested was irrelevant.