Switchgrass contains cellulose, the starting material that, with enough heat and the right enzymes and chemicals, can be made into ethanol fuel.

NPR: Study Boosts Switchgrass as New Alternative Fuel

He began collecting material on a tape recorder when he was 20, starting with the Seeger family's maid, Elizabeth Cotten, a self-taught guitarist.

BBC: Folk singer Mike Seeger dies, 75