Question

The spontaneous creation or variation on established theme within an artistic work is known as

Answer 1

The spontaneous creation or variation on an established theme within an artistic work is known as jazz. Jazz is a very popular musical style that is beloved by many people around the globe. 

Answer 2

Answer:

Improvisation

Explanation:

Improvisation is any activity being done without any kind of preparation or plan and it can be applied to any field inside and outside the arts.