Answer:
1. When it is annoying and not enjoyable
2. When there is rhythm and a nice flow to the notes
3. Just an irritating sound or I try defining what the noise seems like some examples smash, screaming, etc
Explanation:
Illusion, if I understand your question correctly I believe the answer would be illusion
Cubist
they are a very abstract style and often use shapes to represent figures or objects.
Since u already got the answer im just writing this just to get free points