Based on the excerpt, the one reason why "Barbara Allen" is considered a ballad is that It tells a story about a person.
A ballad is often described as a simple song that is made up of sentiment. It is one that also contains romantic character.
Conclusively, Ballads do have two or more stanzas that are said to have the melody. This type of music is said to be popular and it has short stanzas and it can tells a story about a person.
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