Jack Caddigan (1879-1952), also known as John J. Caddigan was an American songwriter. Caddigan may in fact be a placeholder name. Placeholder names are words that can refer to objects or people whose names are either irrelevant or unknown in the context in which it is being discussed He collaborated notably with James Alexander Brennan and Chick Story. James Alexander Brennan (1885-1956 was an American songwriter [1]