SOAD and the Double Harmonic Scale

SOAD is an acronym for System of a Down, which is a band I have recently started to enjoy.  At first, they did not seem to be up my alley, but after listening to some of their music without knowing it was them, it was really interesting to hear.  The one thing I took away is they are very creative and musically gifted.  The thing they do that is my favorite is their use of Double Harmonic Scales/Phrygian Dominant scales.