Live Nation Entertainment, the concert giant that owns Ticketmaster, faces a fight that could reshape the multibillion-dollar live music industry.

The Justice Department and a group of states plan to sue Live Nation Entertainment, the concert giant that owns Ticketmaster, as soon as Thursday, accusing it of illegally maintaining a monopoly in the live entertainment industry, said three people familiar with the matter.

The government plans to argue in a lawsuit that Live Nation shored up its power through Ticketmaster’s exclusive ticketing contracts with concert venues, as well as the company’s dominance over concert tours and other businesses like venue management, said two of the people, who declined to be named because the lawsuit was still private. That helped the company maintain a monopoly, raising prices and fees for consumers, limiting innovation in the ticket industry and hurting competition, the people said.

The government will argue that tours promoted by the company were more likely to play venues where Ticketmaster was the exclusive ticket service, one of the people said, and that Live Nation’s artists played venues that it owns.

Live Nation is a colossus of the concert world and a force in the lives of musicians and fans alike. Its scale and reach far exceed those of any competitor, encompassing concert promotion, ticketing, artist management and the operation of hundreds of venues and festivals around the world.

The Ticketmaster division alone sells 600 million tickets a year to events around the world. According to some estimates, it handles ticketing for 70 percent to 80 percent of major concert venues in the United States.

Lawmakers, fans and competitors have accused the company of engaging in practices that harm rivals and drive up ticket prices and fees. At a congressional hearing early last year, prompted by a Taylor Swift tour presale on Ticketmaster that left millions of people unable to buy tickets, senators from both parties called Live Nation a monopoly.

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