Lollapalooza will celebrate its 25th anniversary this year by expanding from three days to a four-day festival.

The 2016 lineup has yet to be announced, but it will reportedly boast more than 170 acts. The festival is set to take over Chicago’s Grant Park once again from Thursday July 27 to Sunday the 31st.

“It’s our 25th anniversary and we wanted to do something really special and different for our fans,” festival founder Perry Farrell said in a statement. He continued:

With the abundance of talent that wanted to help us celebrate 25 years we got to thinking… “How are we going to fit all those great artists in one weekend?” Then we thought about what a special day Thursday has become. When the party can’t wait for the weekend, the movers and shakers make it happen on Thursday! So, we’ve put together an entire additional day of music to celebrate our milestone year. It’s going to be a fantastic party!

A four-day general admission pass will go for $335, while a one-day ticket is marked at $120. Ticket sales will launch at a yet-to-be-announced later date. Last year’s Lollapalooza roster featured Paul McCartney, Metallica, Florence and the Machine, Alt-J, Alabama Shakes, Tame Impala, Brand New, TV on the Radio and more.

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