When he started playing chess at age 7, Liam Callahan quickly developed a rival — a player who seemed to be a step ahead of his every move. Unable to defeat his dad, Callahan overcame the frustration ...

Yet for as many 99-cent songs as were purchased in the 2000s, anyone who spent time on that era’s file-sharing networks can verify that the LP was still the most important unit for music obsessives.