On grammatical class:

zi'e'a
converts a following bu-letteral into a sumti representing the musical natural note with that name.
zi'e'e
converts a following bu-letteral into a sumti representing the musical sharp note with that name.
zi'e'i
converts a following bu-letteral into a sumti representing the musical double sharp note with that name.
zi'e'o
converts a following bu-letteral into a sumti representing the musical flat note with that name.
zi'e'u
converts a following bu-letteral into a sumti representing the musical double flat note with that name.