Originally Posted by: gmixstudios
what i do not understand is ok so it is equal tempered 12 tone scale but why is it not the case that we have A A sharp B B sharp C C sharp D D sharp E E sharp F F sharp G G sharp

that is what I do not understand

Here is a clue: your list contains 14 notes!

That is why I originally rephrased your question in my first reply to:

The issue you are trying to understand is: why isn't there a separate space for an accidental (a sharp or flat) in between E & F, B & C?

The answer is in several of my replies in this thread. :)

http://www.guitartricks.com/forum/showthread.php?t=27368

Please read through that thread and see if that helps clarify the issue for you.