There are the Next Page and Previous Page controls. Both of them align the page top with the screen top or, said otherwise, take you to the beginning of the page (whatever this page may be). My question is: is there a PDF reader where you can go to the end of the page as well.

In case this question seems ambiguous: let's say the page is three times as high as your screen. Then Next Page will let you see the beginning of a page. Now, what if you want to see the bottom of that page. Okular lacks the corresponding control and you'll have to painstakingly advance the page with Down Arrow or Page Down. There could be some PDF reader where this could be accomplished in a single operation.

I'm not aware of controls that aligns a page to the bottom, but Okular has thumbnails panel with pages thumbnails. You could click on the page thumbnail and drag a selection mark by mouse down to the page's bottom. It much more smooth than dragging scrollbar and allows to align view area to the page's bottom fast enough

All right. But you see, it is about reading a music orchestral score, which may contain some thirty staffs and thus making it fit the screen would make the notes too small. The ideal thing would be to be able to strike a single keyboard key in order to make it go to the bottom of the page. Here, time is crucial. Or perhaps there is more specialized software to do the job, which is a thing I would like to know.