Balance is the arrangement of elements within a piece so that no part overpowers another. Formal balance occurs when a piece has linear symmetry, in other words, if it was divided in half, one side would mirror the other. Structural balance includes symmetry, but also involves ensuring a piece, usually a building structure, is both stable and aesthetically pleasing to the eye.
Upper-case numerals represent major triads. Lower-case numerals represent minor triads. Upper-case numerals with a small plus sign represent augmented triads. Lower-case numerals with a small circle represent diminished triads.
