The Ramp-Up section is a pseudo song created to describe a section of Dazed and Confused. It is the first deviation from the album version of the song itself and represents the ramping up of the performance from the relatively staid early parts of the song to the furious soloing that later performances of Dazed are especially famous for.
Before this section was created the band didn't really take off in Dazed and Confused until they were coming out of the Bow Solo. Although the beginnings of the section were starting to be played in early 71, it wasn't until the following year that it really started to fully form. Once I identified the section, and decided on its beginning and end, I had to go back to find the earliest performances which weren't really ramping up the pace of the song in the beginning so the section seems misnamed at that point, but the title is apt by late 72.
The section usually began and ended with the same quick ascending riff that was repeated 3 or 4 times and then lead directly into the Ethereal Interlude where the mood of the song changed dramatically. The riff is very much like a turning of the page. In the beginning of the section the page is turned from mellow to frantic, and at the end of the section the page is turned back to mellow. In the early performances of the section you basically just have that ascending riff repeated a few times, but the page isn't actually turned over yet.