This combination of instruments was defined as the base of forró by Luiz Gonzaga. Before Gonzaga other combinations have been commonly used. The combination of triangle with accordion is a combination that has already existed in European folk music before and is also used in Cajun music in the United States. Forró thus conserves a format of a small ensemble with multiple (in this case two) percussionists, something that also used to be common in Europe and the United States before the era of the drum set.