Which form of music is mostly continuous and non-repetitive?

Which statement best describe a difference between the romantic artist delacroix's liberty leading the people and neoclassical artist davids oath of the horatii

Visual rhythm indicates movement and suggests unity of form by the repetition of elements.

What is one popular pop artist or group (from today or from the past)? why does this person/group's music fit into the pop genre? why do you think the person/group was successful with their music?