Country star Garth Brooks' "Blame It All On My Roots Tour" begins in August, with one price for every seat.
"We're here not because Ticketmaster's conduct is inconvenient or frustrating ... we're here because it's illegal," Garland said.
The Justice Department and several states are expected to file a lawsuit as soon as Thursday against Live Nation Inc, citing alleged antitrust violations at least in part due to the market dominance of the company's Ticketmaster unit, a person briefed on the planned legal action said.
The Justice Department is expected to file an anti-trust lawsuit against Live Nation Entertainment
Taylor Swift fans took Ticketmaster to court in downtown Los Angeles on Monday, accusing the company of intentionally misleading them when the star released tickets for her "Eras" tour in November.
The lead singer of the new wave band said Ticketmaster will be giving partial refunds after some ticket buyers for his band's US tour were charged more in service fees than for the cost of their seats.