Ballads use a line stanza.
three
four
five
six

Ballads use a four line stanza.

Explanation:

Ballads are a sub-genre of narrative poetry that is usually adapted for singing or recitation and accompany dance, and which uses four-line stanzas, commonly alternating four-stress and three-stress lines, with the second and fourth lines rhyming. Usually, ballads are distinguished for being romantic, sentimental, or dramatics, or for having a plot.