The most genuine and popular folk style of Northeast Brazil, Baião is a genre and dance style based on the pulse of the zabumba, a flat, double-headed bass drum played with a mallet in one hand and a stick in the other, each striking the opposite head of the drum for alternating high and low notes, frequently accompanied by an accordion and a triangle pattern. The baião rhythm is integral to the genres of forró, repente and coco (or embolada). It is mostly associated with the state of Pernambuco. Baião was popularized via radio in the 1940s, reaching peak popularity in the 1950s.
This description uses material from the Wikipedia article Baião, which is released under the Creative Commons Attribution-Share-Alike License 3.0.