Today’s history highlights a major milestone for digital music, the debut of an early rock classic, and legal troubles for a few rock legends. Notable Births 1865: Composer Alexander Konstantinovich Glazunov was born. 1909 (HistoryNet): Leo Fender, the visionary inventor behind the first mass-produced electric guitar, was born. 1928 (HistoryNet): Singer, actor, TV host, and…