Final answer:
Rubato is the term for when music has no steady tempo. It allows for a more expressive and emotive interpretation of the music.
Step-by-step explanation:
The term for when music has no steady tempo is Rubato. Rubato is an Italian term that means 'to rob' and it refers to the practice of flexibly speeding up or slowing down the tempo of a musical performance. It is commonly used in solo piano music and allows for a more expressive and emotive interpretation of the music.