1973 � KISS make their stage debut, performing at the Coventry Club in Queens, New York.

1969 � The Beatles perform in public for the last time, an impromptu, traffic-stopping lunchtime concert on the roof of Apple's Saville Row offices in London that's filmed for Let It Be.

1949 � Spurred by Columbia Records' new 33-1/3 rpm LP format, rival RCA-Victor introduces the 7" 45 rpm single and a compact new machine to play it on�the death knell of the 78 record. The vinyl single will dominate records and radio until the advent of the CD in the '80s.

1954 � After losing an acrimonious patent fight with employer RCA, Edwin Howard Armstrong, inventor of FM radio, leaps from his 13th floor New York City apartment. His widow Marian�former secretary to RCA chief David Sarnoff�renews the FM patent battle with RCA, eventually prevailing in 1967. The hi-fi stereo signal of Armstrong's broadcast format quickly revolutionizes rock radio.
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