Writing a 4 part harmony can be very difficult if you don’t understand the basic principles behind voice leading and arrangement. There are countless rules one must follow to emulate the stylings of Bach, Mozart, and Beethoven. But these rules are not needed just to arrange a simple progression! This video goes through the fundamental concepts of harmony and arrangment without getting into the weeds of clefs, notation, and actual “rules”.
By the end of the lesson, you should be able to arrange any chord progression for other instruments, and hopefully get new insight into the sorts of complex harmonies that can exist within a chord progression.