I think it would be close to impossible to teach how to successfully convey emotions through music, given that human emotional response to music is incredibly subjective and personal. Sure, there are certain types of chords that have general feels to them, such as sadness for minor chords, happiness for major chords, a feeling of danger or unease for augmented / diminished chords, etc. etc... But really, there are so many emotions out there, often complex, and any of them can be found in music. Even songs in minor keys can make a listener feel happy or uplifted.
So yeah, my two cents.
*EDIT - Aw snap(ple), beaten to the punch. Oh well.