We've got good news and we've got bad news.

Good news first.

Two more musical acts have been added to Forbes' Under 30 Music Festival, taking place at Festival Pier during the business mag's second annual Under 30 Summit.

Pop singer Shawn Mendes and hip-hop sensation Fetty Wap have been added to the lineup, which includes Lindsey Stirling and Hanson.

Now for the bad news.

Previously announced headliner Avicii has backed out of the gig in order to take some time off, though he's set to headline the free concert next year.

8,000 free tickets will be made available on Monday, Sept. 21 to those who have registered and remained active in online charity forum Global Citizen.

VIP tickets, which include early entry to the Tuesday, Oct. 6 show, are on sale now.