From The Information Theory of Emotions of Musical Chords, posted on ArXiV today:
My basic hypothesis is as follows. While perceiving a separate musical chord, the value of a relative
objective function L that is directly related to the main proportion of pitches of its constituent
sounds is generated in the mind of the subject. The idea of an increasing value of the objective
function ( L>1 ) accompanied by positive utilitarian emotions corresponds to a major chord, while
the idea of a decreasing value of the objective function ( L<1 ) accompanied by negative utilitarian
emotions corresponds to a minor chord.
I naturally thought of The Mathematics of Love: