Originally Posted by: MixedupDoes anyone know the scale they used ?
Likely what you're asking is answered by the Blues Scale version of the Pentatonic Scale.
Go through these:
http://www.guitartricks.com/search.php?search.x=17&search.y=11&search=Submit&input=blues+scales
A good example:
http://www.guitartricks.com/lesson.php?input=9449