A reader shares a report: Steve Stepp and his team of septuagenarian engineers are using a bag of rust, a kitchen mixer larger than a man and a 62-foot-long contraption that used to make magnetic strips for credit cards to avert a disaster that no one saw coming in the digital-music era. The world is running out of cassette tape (Editor's note: the link could be paywalled; alternative source). National Audio Co., where Mr. Stepp is president and co-owner, has been hoarding a stockpile of music-quality, an-eighth of an inch-wide magnetic tape from suppliers that shut down in the past 15 years after music lovers ditched cassettes. National Audio held on. Now, many musicians are clamoring for cassettes as a way to physically distribute their music. The company says it has less than a year's supply of tape left. So it is building the first manufacturing line for high-grade ferric oxide cassette tape in the U.S. in decades. If all goes well, the machine will churn out nearly 4 miles of tape a minute by January. And not just any tape. "The best tape ever made," boasts Mr. Stepp, 69 years old. "People will hear a whole new product."