The following videos are provided courtesy of the Western Band Association. WBA judge coordinator Shirlee Whitcomb explains in great detail the philosophy that drives the scoring of the units within the AzMBA. The AzMBA sheets are largely derived from this competitive model. Take a moment to familiarize yourself with the terminology and philosophy used within this particular scoring system. It is important to note that scores are determined from both design and excellence under a model of Derived Achievement. What and How.