Why are major chords happy and minor chords sad? It has a lot to do with the concept of brightness - relative sizes of intervals and how we psychologically perceive larger intervals to be "brighter." BONUS VIDEO (more theory!) below! https://www.youtube.com/watch?v=OAgd_3inRt8 Modalogy http://www.amazon.com/Modalogy-Scales-Chords-Primordial-Building/dp/1458413977/ref=cm_cr_arp_d_product_top?ie=UTF8 Follow me on the internets.... http://www.facebook.com/adamneely http://www.instagram.com/its_adamneely Peace, Adam