Grady Colonna sonora

Don Louis Agrati, better known as Don Grady, was an American actor, composer, and musician. He was well known both as one of Mickey Mouse's original Mouseketeers, and as Robbie Douglas on the long-running ABC/CBS television series My Three Sons. His sister was also an actress, billed as Lani O'Grady. Their mother was a talent agent, known as Mary Grady.
Read more: Wikipedia