Magma is a French prog-rock outfit that formed in 1969. Although they are known for epic  orchestral arrangements inspired by Carl Orff, I love this stripped-down vocal, piano and bass version of Otis from 1981. Founding drummer / singer Christian Vander sings about the destruction of the earth in a language he constructed called Kobaïan. Buying can get pricey, but I just noticed their albums are dirt-cheap on iTunes.