Hi Everyone, This is a tutorial about an organised and easy way to think about upper structure dominant 7th polychords. An upper structure on a Dom7 chord is the addition of a 9th, 11th or 13th. All of which can be altered to b9, #9, #11, b13 wherever applicable, giving a plethora of different available sounds which can quickly become a logistical quagmire to work out.