Lawyers from Latham & Watkins and Wachtell, Lipton, Rosen & Katz are nervously eyeing a call by the chair of the Senate Judiciary committee on Monday for antitrust review of the $2.5 billion merger between Live Nation and Ticketmaster.

The deal was criticized by both music fans and musicians when it was announced in February — Bruce Springsteen posted this disparaging letter on his Web site — for merging the concert-promoting operations of Live Nation and ticket-selling capacity of Ticketmaster into one industry behemoth.