Rock Star BreakupsSteven Tyler flirted with leaving Aerosmith after 40 years. From the Beatles and the Supremes to Guns N' Roses and 10,000 Maniacs, view our gallery of bands on the run.Updated Jul. 14, 2017 7:24PM ET / Published Nov. 10, 2009 10:45AM ET John Shearer, WireImage / Getty Images