What is the poetic structure characterized by alternating eight and six syllables per line called?

The poetic structure characterized by alternating eight and six syllables per line is known as a ballad. Ballads typically follow a pattern of quatrains, where the first and third lines have eight syllables, while the second and fourth lines have six syllables. This rhythmic pattern contributes to the musical quality of ballads, enhancing their storytelling nature, which often relates to folklore, romance, or historical events.

Ballads are often used for their accessibility and ability to convey narratives in a succinct and emotive manner. This structure is distinct from other poetic forms such as sonnets, odes, and villanelles, which have their own specific syllabic patterns and thematic focuses that do not align with the alternating eight and six syllables characteristic of ballads.