Old Crow Bourbon is named for the inventor of the sour mash process, Dr. James C. Crow. In fact, in 1835 Old Crow bourbon was the first bourbon to begin using this process that today, has become a standard in the bourbon industry. Old Crow is the original sour mash bourbon.
The term “sour mash” is frequently misunderstood. "Sweet" mash whiskey is produced by using fresh water to begin the fermentation, while "sour" mash includes the addition of the mash from a previous distillation. This results in a slightly sweeter and heavier bodied whiskey; it is not at all sour as the term suggests.