Bobby Darin cramped everything into the mere 37 years he lived. He was a multi-talented man who played the drums, piano, harmonica, guitar and what not. He was a successful actor, energetic entertainer, and a superb singer. Of course he is known mostly for his interpretations of "Mack The Knife", "Beyond The Sea", his early hits "Splish-Splash" and "Dream Lover". But among the many songs he wrote, arranged and produced, he also wrote and recorded great folk songs. He did a great version of Tim Hardin's "If I Was A Carpenter", his last real hit. After the assasinations of Martin Luther King Jr. and Robert Kennedy, who's campaign he promoted, he wrote more politically motivated songs. They wouldn't become hits, but they are still great songs.
"Simple Song of Freedom" is just that and unfortunately has lost none of it's topicality. Seems like politicians haven't learned much since the 1960s. This is taken from a 1970's TV Special "A Night With Bobby Darin" and can be found on the DVD of the same name (Umbrella Entertainment), which also has a nice 43 min. biography.