Andrew Druckenbrod is dismayed to learn that his precious CDs may be self-destructing. “Indeed, what does it say that a music box metal disc made 150 years ago or a paper piano roll from the turn of the previous century may outlive a digital product of today? It makes me want to pack a 19th-century survival kit: Dangnabit, where are my lard candles, salt pork and wool undergarments?”