Lollapalooza: Bruno Mars, The Weeknd Top This Year's Music Fest

CHICAGO, IL — The Weeknd and Bruno Mars will headline this year's Lollapalooza music festival in Chicago. Organizers for the four-day outdoor concert event this summer announced the lineup Wednesday. Jack White, Artic Monkeys, Tyler the Creator, The National, Vampire Weekend and St. Vincent are also on the bill.

In anticipation of the announcement, a Lollapalooza-designed CTA train — dubbed the "LollaTrain" — ran on the "L" through the Loop on Tuesday. Passengers could try to guess acts in the lineup from clues in the train car.

The festival runs Aug. 2-5 in Grant Park, with more than 180 musical acts playing on eight stages. Four-day passes cost $335, and they are on sale at Lollapalooza's website. High-end VIP and platinum passes also are available. Single-day tickets will go on sale soon.

Other acts performing at this year's Lollapalooza include: LL Cool J, Gucci Mane, Chvrches, Franz Ferdinand, Travis Scott, Odesza and Logic. One performer absent from the lineupe is South Side rapper/worldwide sensation Chance the Rapper.

Go to Lollapalooza's website for the complete lineup to the 2018 festival.

Bruno Mars at the 60th annual Grammy Awards on Jan. 28 in New York City. (Photo by Christopher Polk | Getty Images for NARAS | Getty Images)