Huron, David, and Matthew Davis. 2013. “The Harmonic Minor Scale Provides an Optimum Way of Reducing Average Melodic Interval Size, Consistent With Sad Affect Cues”. Empirical Musicology Review 7 (3-4):103-17. https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/EMR/article/view/3732.