The concert industry saw record-breaking business this year, as well as substantial staff shakeups, according to Billboard's Year in Music 2013. The touring sector is booming after a major slump three years ago, mainly as the result of a "back to basics" concentration on value, pricing, and marketing. Global gross ticket revenue is up almost 30 percent and concert attendance is up 26 percent, based on figures reported to Billboard Boxscore. Live Nation posted its best numbers to date this year, with concert ticket sales up 15 percent year-over-year and more than 20 million tickets sold in North America. Meanwhile, Anschutz Entertainment Group's announcement in September 2012 that it was for sale took the industry by surprise, but even more surprising was when AEG went off the block in March, concurrent with the resignation of CEO Tim Leiweke. This was the start of a sweeping restructuring of the global sports and entertainment giant, while in October a Los Angeles jury determined that AEG Live was not guilty of negligence in the hiring of Conrad Murray, the doctor convicted of manslaughter in the death of Michael Jackson. The case will most likely change the way producers hire tour staffers in the future. Also in 2013, festivals bolstered their positions as pillars of the North American summer concert industry, with Coachella earning a record box office score of $67 million in its second year.