In theory, you could write a module that uses hook_menu_alter(). It would modify the access callback element in the "admin theme" menu item (and maybe sub-menu items?). The callback function would check user_access('administer themes'). You could probably write this in 30 minutes or less.

That would cover both cases -- the block admin page and the admin menu.

Administer block permission let the user to see admin theme name
I've noticed that a variety of pieces in the classical repetoire (certainly at least the piano repetoire), label what seems to be effectively the same key signature differently. That is, I am not aware of any differences in terms of key between a piece in "G Sharp major" and "A flat major" (or their equivalent minors). Is there any reason that sometimes a sharped key signature is used while at other times the equivalent flatted key signature is used?

As a related point, I have undoubtedly noticed the preference of certain "equivalent" key signatures over others. For example, one encounters "E flat" significantly more than "D sharp" and likewise "C sharp" significantly more than "D flat". Is there any particular reason for this, or is it simply a convention that has been handed down to use through musical history?
