Answer:
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
I am a box who holds keys but not locks. With the right combination I may unlock your soul
I am known for my natural tuxedo and marching. What am I?
I am black within and red without With four corners round about.
I can speak with my hard metal tongue. But I cannot breathe for I have no lung
I start with T end with T and within me is T.