[Wendy Cutler]

Thank you! Edited - I did Geoff's suggestion while @Zubersoft was typing. 

So I get the source types, like Song or Setlist, to include the group of values I want to view and edit, in this case Keys; then on a main menu, click that type (Keys), which lists all the values, like it does when I click Song or Setlist. Then do the delete there, same as when I delete a song. 
I've never touched anything on that line except Song or Setlist.
It was pretty easy. Quick too.