ShinyHunters, the group claiming responsibility, says the stolen data includes names, addresses, phone numbers and partial credit card details from Ticketmaster users worldwide.
The hacking group is reportedly demanding a $500,000 (£400,000) ransom payment to prevent the data from being sold to other parties.
The number of customers affected by the data breach has not been confirmed by Live Nation.
The Ticketmaster breach was first revealed by hackers who posted an advert for the data on Wednesday evening.
Ticketmaster refused to confirm it to reporters or customers and instead notified shareholders late on Friday.
On Friday Santander confirmed it had data from an estimated 30m customers stolen which was being sold by the same hacking group as the Ticketmaster hackers.
If the data hack is as large as claimed by ShinyHunters, the hack could be the most significant breach ever in terms of numbers and the extent of the data stolen. »