Summary: Learn how to play different scales and modes in the key of A in this free video on jazz music theory - diminished scale.
"Now we are going to go over our A diminish so we start right here on our A and we have this repetitive half step, full step pattern. So if you look at it you have a half step 1 note, whole step skip a note, so whole step, whole step, half step, whole step, half step, whole step, whole. So this our diminish scale that uses the group of 2 on the top of the group of 3. And that is our A diminish scale. "
eHow Article: Scales with Root A: Diminished