Try the Harmonic minor scale,it goes :
Root,major 2nd,minor 3rd,4th,5th,minor 6th,major 7th.
They also use the 5th mode of this scale a lot-and oddly it is often referred to as the Spanish Phrygian scale and
sometimes Spanish Gypsy scale(not a direct reference to them)
It goes:
Root,minor 2nd,major 3rd,4th,5th,minor 6th,minor 7th.
Hope that helps, good luck with it.
