Concert promoter Live Nation and ticketing giant Ticketmaster Entertainment said this morning that they plan a merger of equals.

The combined company will be called Live Nation Entertainment.Regulatory experts have said the deal could get delayed by an antitrust review.

Ticketmaster sells tickets for more than 80 percent of the major arenas and stadiums in the U.S., according to concert tracking firm Pollstar. Live Nation is the world's No. 1 concert promoter and owns more than 140 venues. It has comprehensive deals to the tours of such artists as Madonna, Jay-Z, U2, Nickelback and Shakira -- and recently developed its own ticketing service.