P.S. I have been thinking and wondering.
If for example in a composition/transcription the pianist is supposed
to play a “B” with the left hand and a “C” with the right hand at the same time
and it sounds as if the pianist “makes a mistake”...every time...
What could be the musical purpose of creating a sound like this?
Thanks from Kristina.
Your ear likes consonant harmony, as does pretty much everyones.. so you dislike hearing a certain sound.. like a minor 2nd (your example)
Suppose our composer is instead a painter.. you don't always paint sunshine and flowers, you may like to create something more confronting... Sounds don't have to sound good, and ones that sound bad don't have to sound like mistakes, they are simply bad sounds that create an effect.
For a closer parallel to use of dissonance in tonal compostition - Suppose our composer is instead a film maker. He creates a conflict, which provides intrigue and interest, it puts the audience on edge.. then he follows it with a resolution. The emotion transition is effective.. Tense and uncomfortable followed by a happy ending makes an effective likable film..
..or for that matter, some artists like to leave their conflicts unreasolved.. to make a viewer/listener walk away with a negative feeling.. it communicates negative emotions, the sound of anger for example.