Here's why it's uncommon:
* Traditional Ballad Structure: Ballads often use an ABAB or ABCB rhyme scheme, which creates a more complex and musical flow. The alternating rhymes create a sense of movement and momentum.
* Emphasis on Narrative: Ballads are primarily storytelling poems. The focus is often on the narrative and characters, and the rhyme scheme serves to support that. While AABB can be used effectively, it can sometimes feel a bit monotonous or repetitive over a long ballad.
However, there are no strict rules:
* Modern Ballads: Modern ballads can experiment with different structures and rhyme schemes. Some poets might choose AABB to create a specific effect or to emphasize certain aspects of the story.
* Simple Ballads: AABB can be effective for shorter or simpler ballads, especially those with a more lyrical or sentimental tone.
Ultimately, whether a ballad should use AABB or another rhyme scheme depends on the poet's individual goals and the overall effect they want to achieve.
Here's an example of a short ballad with an AABB rhyme scheme:
_The wind blew cold across the moor,
And shadows danced in the dying hour.
A lone wolf howled beneath the moon,
As darkness fell, a mournful tune._
This ballad uses AABB throughout, creating a simple and mournful tone. The repetition of the rhyme scheme adds a sense of urgency and melancholy.
Conclusion: While not as common as other rhyme schemes, AABB can be used effectively in ballads. It's important to consider the overall effect you want to create and whether AABB is the best choice to achieve it.