Live Nation Entertainment disclosed in an 8-K filing Wednesday that Jason Garner, the head of its concert business, has left the company. In light of the departure, Live Nation has promoted three of its key veteran executives.

Longtime promoters Mark Campana and Bob Roux have been promoted to presidents for the North and South regions in North America, respectively. And concert industry vet Rick Franks has been elevated to president of North America, talent/touring. Campana and Roux will be based in Chicago and Houston, respectively, and Franks will remain in Detroit.

"The economy has impacted our industry in 2010 and it looks like it will be another factor in 2011, so we need to focus on the right acts in the right markets with the most efficient organization to continue driving our leadership position," Live Nation CEO Michael Rapino said in an internal memo. "Our goal in 2011 is to grow our market share in arenas and amps in the top markets and increase NA profitability back to 2009 levels."

Citing people familiar with the matter, the Wall Street Journal reports that there could be some layoffs coming at Live Nation. But the numbers won't likely be large, according to those sources.

Meanwhile, Campana and Roux will oversee booking, operations and venues in their respective territories. The northern region comprises New York, Boston, Philadelphia, Detroit, Cleveland, Chicago, St. Louis, Pittsburgh and Indianapolis. And the southern region comprises Florida, the Carolinas, D.C., Atlanta, Texas, Phoenix, Las Vegas, Seattle, Denver, New Mexico and California.

Additionally, Ron Bension, formerly president of Tickets Now, has been named CEO of Live Nation's House of Blues and club division. He will be based in Los Angeles, reporting directly to Rapino.