Watch the Chord Order online guitar lesson by Matthieu Brandt from Songwriting on Guitar
In any major or minor key you'll have at least six triads to play with and four, five or six note varieties plus their inversions. The order in which you place them, will give a certain song section its feel. A section might feel open when it ends with a chord or chord progression that is not in balance; it's not the tonic chord. The progression wants to move forward and you can't end the song there. It'll feel closed when you end it with the tonic chord. There are degrees of openness and closedness you can create, depending on which chord you place at the end of a section. Other elements that influence this feel can come from the melody, rhythm and even the lyrics. Symmetry and assymmetry within a chord progression also influences the amount of openness and closedness.