ballad

ballad - noun - a simple song of natural construction, usually in the narrative or descriptive form, usually having several verses of similar construction and may or may not have a refrain

baroque

baroque – adj - Of or pertaining to a style of architecture and art originating in Italy in the early 17th century and variously prevalent in Europe and the New World for a century and a half, characterized by free and sculptural use of the classical orders and ornament, by forms in elevation and plan suggesting movement, and by dramatic effect in which architecture, painting, sculpture, and the decorative arts often worked to combined effect.

In my opinion, "movement" and "dramatic effect" are the key terms. These elements are prominent in Caravaggio's Conversion of Saint Paul (1600).