Add sausage to pan; cook 8 minutes or until sausage is browned, stirring to crumble.
Add celery, carrot, garlic, and bay leaf; cook 10 minutes or until onions are golden brown, stirring frequently. Stir in mushrooms; cook 10 minutes or until mushrooms release moisture. Stir in barley, chicken broth, brandy, salt, and pepper. Bring to a boil; cover, reduce heat, and simmer 1 hour or until barley is tender. Discard bay leaf.