What is "balbale"

Balbale (from Sumarian bal—change—); is a Sumer form of poem; a kind of changing songs, parallelism. Most part of Tammuz and Enkimdu (an adamanduga) consists of changes like this. There’s a reference to balbale in the colophon of the poem. Though it also may refer to the dialogue form of the writing. All hymns signed as balbalaes ( Hymns to Ninurta, Hymns for Shu-Sin) contain changing repetitions. It is the most important feature of balbale. Dialogues referred as balbale consist of changing and unchanged periods also.