Live Nation Entertainment Inc, the world's No. 1 live music company, has parted ways with Jason Garner, the head of its concert business, according to a regulatory document filed on Wednesday.

Garner, who was chief executive of Live Nation Worldwide, left the company last Friday the filing said.

The departure is the latest in a string of management and boardroom shake-ups at the company, which has been struggling in the weak U.S. economy since it completed a controversial merger in February.

Live Nation Entertainment was created by the combination of concert promoter Live Nation and Ticketmaster Entertainment, the leading ticketing company headed by artist manager Irving Azoff. Azoff is currently executive chairman.

On Oct. 15, IAC/InterActiveCorp Chief Executive Barry Diller stepped down as nonexecutive chairman of Live Nation, revealing board rifts among directors with allegiances to the old companies. Liberty Media Chairman John Malone replaced him as interim chairman.

Live Nation Chief Executive Michael Rapino came under fire from investors during the summer for an underwhelming Investor Day presentation.

Live Nation will announce its third-quarter earnings on Thursday.