Some thoughts on contrast:
In the world of fashion, I’m told it is a good rule to follow to wear one piece of clothing as the focus for your outfit. Make the focus piece obvious (colourful and/or patterned) and make all your other clothes darker and more plain in comparison. For example a brightly coloured, patterned shirt as the focus, and plain dark pants, jacket, and shoes to support. It is the contrast which makes it work. If it was all bright patterns, it would clash and likely not be pleasing to the eye. The same if it was all black. No contrast. Boring. Slightly morbid too!
The same thing happens in food. Eating a chocolate, washing it down with a sweet soda and an ice cream with syrup on top. It’s too much of a good thing. No contrast. Food manufacturers have figured out the perfect balance of salt, sugar, and fat to tease our senses. There needs to be a contrast in tastes, and in food types to satisfy truly.
The same with music and audio. A piece of music needs to have light and shade to work. A whole song of thrashing guitar solo after guitar solo is just too much and becomes very boring. Too much bass in the mix gives you a headache. Use light and shade to build up to a crescendo however, and it will raise the hairs on your neck.
Contrast is the way forward!