The Department of Justice has asked Ticketmaster Entertainment Inc. and concert promoter Live Nation Inc. for more information about their proposed merger, the companies said Friday.

It is the second request from the DOJ, indicating that it is scrutinizing the deal closer than most. The companies said the request was expected, and that they're cooperating with the antitrust investigation.

Ticketmaster is the world's largest seller of tickets to concerts and shows, and Live Nation is the largest U.S. operator of concert venues, with more than 140. Artists have expressed concern that a combination would lead to a near-monopoly on large-scale concerts.

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