Originally Posted By: Byron Dickens

You're both not quite correct. A major most certainly is in the key of D minor.


I think you maybe misinterpreted the term minor major 7th. Apparently because you saw the word major.

Please read +++THIS+++ and sit at your piano while you do.

A D minor major 7th has to do with one weird chord, not the context of the scale where some of the chords along the path from octave to octave are major chords. A D minor 7 remains a minor 7 even when the 7 is sharped, making it a minor chard with a maj 7th voicing.

I'd refer you to Dr John Venesile, one of music professors, had he not died in 2016 from pancreatic cancer. LOL!

Also check +++THIS+++ Wiki page that defines Aeolian mode as the natural minor scale.