The Importance of Libraries and What We Do

I've seen all types of Top Five's for different areas of education, but rarely do I see a Top Five for school libraries (or libraries in general!)  So I combed through then scoured Youtube looking for what I think are the top five videos about and for libraries and this is what I found.  My criteria were:
1. Had to be about school libraries
2. Definitely no cheesiness!  It has to have importance attached to it
3. Well done format.

So, here are the Top Four.  I searched as much as I possibly could for a fifth and couldn't find one, so if you do, please add a comment with the link! :)

School Libraries Matter: The Changing Role of the School Librarian

Principals Know: School Librarians are the Heart of the School

 School Libraries from NJASL

What Are Databases and Why You Need Them