How a Bill Becomes a Law in the U.S. Congress

I remember watching this clip on TV when I was just a boy. I think it aired in the mid-to-late '70s and early 80s. It is how I first learned how a bill becomes a law in Congress. Here it is:

http://www.youtube.com/watch?v=mEJL2Uuv-oQ

P.S. You'll catch yourself humming the the tune from this clip after you watch it.