Felix Powell
Felix Lloyd Powell was a Welsh British Army Staff Sergeant most famous for writing the music for marching song Pack Up Your Troubles in Your Old Kit Bag and Smile, Smile, Smile, in 1915, during World War I. The words were written by his brother George Henry Powell , and the song was entered into a competition for best moralebuilding song. It won first prize and was noted as perhaps the most optimistic song ever written.
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Source: Wikipedia