[O] Help: Saving Agenda Views

[Tory S. Anderson]

I'm trying to save an agenda view that I can arrive at in the following way: 

1. Load agenda                  (default 1-day view)
2. / TAB "English_Class"        (reduce to only entries tagged English_Class)   
3. \ - TAB "schedule"           (further reduce by removing entries having a 
:schedule tag)
4. w                            (load a 7-day span, week-view)

However, I've been unable to grok the directions at 
http://orgmode.org/worg/org-tutorials/org-custom-agenda-commands.html 

The closest I've come is this: 

--8<---------------cut here---------------start------------->8---
(setq org-agenda-custom-commands
      '(("c" "Class agendas" agenda "" 
        ((org-agenda-tag-filter '("+LMC_6215"))
         (org-agenda-span 7)))))
--8<---------------cut here---------------end--------------->8---

But while this successfully sets the span, it fails to filter the buffer (let 
alone getting to my second filter). Where am I going wrong?