How did stock images such as snow-white and blood-red help ballad singers?
In the context of oral tradition, ballad singers rely on conventional, stereotyped imagery—such as describing things as "snow-white" or "blood-red"—to serve as mnemonic aids.
Because ballads are performed orally, these recurring conventions fall into place almost by reflex action. This helps ease the strain on the singer’s memory, allowing them to focus their attention on the dramatic delivery and manipulation of the story rather than searching for individualistic or complex figures of speech. Furthermore, because music occupies much of the listener's attention, these simple, predictable images ensure the narrative remains accessible and clear, adhering to the ballad decorum that prioritizes the impersonal projection of the story over linguistic originality.1