John Lewis Schumann[1] (born c. 1953[2]) is an Australian singer, songwriter and guitarist from Adelaide. He is best known as the lead singer for the folk group Redgum, with their chart-topping hit "I Was Only 19 (A Walk in the Light Green)", a song exploring the psychological and medical side-effects of serving in the Australian forces during the Vietnam War. The song's sales assisted Vietnam Veterans during the 1983 Royal Commission into the effects of Agent Orange and other chemical defoliants employed during the war.

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