Grace Slick, the trailblazing vocalist that fronted the Jefferson Airplane, turns 79 today. October 30 is also the birthday of Timothy B. Schmit of the Eagles and AC/DC veteran Chris Slade. Bill Berry announced he was leaving REM on this day in 1997, and U2, Metallica, Ray Davies, Jeff Beck and Lou Reed made unannounced appearances with Mick Jagger during the Rock Hall Of Fame 25th anniversary concert at Madison Square Garden on this day in 2009.