Eb major
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well providing you're starting from that D as the lowest note its D locrian....which is a mode of Eb major
i think it's F Dorian
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Hmmm, Its D, Eb, F, G, Ab, Bb, C, D, Eb (I think?), D major goes D E F# G A B C#, so this scale goes 1 b2 b3 4 b5 b6 b7, which, yep, makes it D locrian. I just wanted to figure it out for myself.