Where could one possible start and not resort to a long list. I guess one suggestion might be this Dale Carnegie publication.

Many years ago, the Carnegie Foundation for the Advancement of Teaching and the Carnegie Institute of Technology conducted investigations that found about 15 percent of one's financial success is due to technical knowledge; 85 percent is due to skill in human engineering -- personality and the ability to lead people. (More on this later if need be)

Above all In my humble opinion hands down there is no better character builder than the Holy Bible.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….