"And harmony means that the relationship between all the elements used in a composition is balanced, is good"

In this quote, Karlheinz Stockhausen is describing the principle of harmony in music structure. He is suggesting that consistency is accomplished when the elements utilized in a composition are balanced and work together in a pleasing way. This could describe the balance between various instruments, the balance in between various musical components such as tune and rhythm, or the balance in between different areas of a piece. Consistency is a vital part of music composition, as it assists to produce a pleasing and unified noise. It is also essential for developing a sense of unity and cohesion within a piece. By achieving consistency, an author can ensure that their composition is pleasurable to listen to which all the elements work together to produce an unified sound.