Although a number of types of whiskey are produced in the US two types, Bourbon and rye, are dominant. A similar situation exists in Canada. Bourbon whiskey is of greatest large number of brands are available. Each has its own character istic flavour and considerable care must be taken during production to ensure consistency of the end product. Some brands are defined as ‘sour mash' and must meet a number of legal require ments during production(see page 416).