Rabindranath Tagore does not need any introduction. We also know that his composition Jana Gana Mana is India’s National Anthem. But do you that his other composition Amar Shonar Bangla is Bangladesh’s National Anthem. Also, the original song of Sri Lanka’s National Anthem was also written and tuned by Tagore.

source: http://en.wikipedia.org/wiki/Rabindranath_Tagore