Around the time I bought my first SPU, I wrote my first article for the New York Times. It was about a Baltimore man named Leon Kagarise, a TV repairman, audio engineer, and avid collector—well, hoarder—of records. Crammed into his little ranch-style house, tens of thousands of LPs not only turned his rooms into canyons but found their way into his bathtub and bed. Secreted among the vinyl were stacks of reel-to-reel tapes marked with the names of the biggest country and bluegrass stars of the last century. Leon…