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Bb Double Harmonic Scale notes: Bb Cb D Eb F Gb A. Formula: 1 b2 3 4 5 b6 7. Chords in this scale: Bb, Cb, Dm, Ebm, Gbaug.
Double harmonic major has two wide steps, one on each half: 1 b2 3 4 5 b6 7. It is the classic Arabic and Byzantine sound, and the scale behind surf rock tunes like Misirlou. Over a major chord it sounds instantly exotic; play the b2 and b6 slowly and let them resolve.