In addition to posting the album’s lyrics, The Roots’ Dec. 6 concept album, undun, is streaming over at NPR right now. You can read it; you can listen to it. Starting Thursday, Dec. 1, you’ll be able to get inside it. The Philadelphia band is putting out an application specifically tailored to the life and times of Redford Stephens, the fictional person on whom the new LP is based. The app will illuminate details of Stephens’ short (25 years) life by using lyrics, images, interviews and clips from music videos.