Clicking on page 2 or Next on http://www.hooktheory.com/theorytab/artists/z/zun goes to http://www.hooktheory.com/theorytab/artists/z?page=2.
What it should do is go to http://www.hooktheory.com/theorytab/artists/z/zun?page=2.
Clicking on Page 1 on the above link goes to http://www.hooktheory.com/theorytab/artists/z?page=1 instead of the first link.
This bug is still not fixed, and probably actually applies to any artist that has more than 100 songs under their name.
A fix is possible, buy having the [2] button on the bottom of the page to properly link to artists/[Letter]/[Name]?page=2 instead of the broken artists[Letter]?page=2.
EDIT: And someone else made a thread, too: Artists' songs with multiple pages incorrect link