Here's why:
* Sonnet is a type of poem with a specific structure (usually 14 lines with a rhyme scheme). It can explore various themes like love, loss, beauty, nature, etc.
* Ballad is a type of narrative poem often featuring a story with a simple plot, dialogue, and sometimes a refrain. Ballads often explore themes of love, betrayal, heroism, and fate.
"Sonnet-ballad" might refer to a poem that:
* Combines sonnet form with ballad elements: This could be a sonnet that tells a story with narrative elements or a ballad that uses sonnet structure.
* Is written in both sonnet and ballad styles: A poem might have sections written as sonnets and other sections written as ballads.
Therefore, the theme of a "sonnet-ballad" depends on the specific poem and its content.
To understand the theme of a poem called "sonnet-ballad," you'd need to read the poem itself and analyze its content.