By Walt Hickey Sertanejo Prosecutors in five Brazilian states have investigated officials in 81 different cities around their spending on concerts amid public outcry over local political leadership shelling out huge sums of public money to artists. The investigations have ensnared artists in the most popular genre of music in Brazil, sertanejo, and they may be required to refund 20 percent of the revenue from a show or face bans. A Brazilian paper found the state of Mato Grosso spent