Sour beer styles range in seemingly unlimited flavors from fruity and neutrally acidic, to bitter or sweet. The brewer should choose bacteria and yeast strains carefully to achieve the desired flavor profile. This document serves as a guide to illustrate selected bacteria and yeast profiles and combinations for sour beers styles, including common combinations that have been validated extensively in commercial trials, as well as some more unique strain combinations. This is not a comprehensive list, many other combinations are possible for the creative and adventurous brewer.