More than 20 years have past since the first Lollapalooza rocked the music world — and based on this summer's newly released lineup, the massive music festival shows no signs of turning down the volume. 


For the eighth year in a row, bands such as the Red Hot Chili Peppers, The Black Keys, and Florence and the Machine will converge on a 115 acres in Chicago's Grant Park. In total, more than 120 acts are slated to perform over three days. Last year's attendance was estimated at more than 270,000. 


"This year our multi-colored lollipop swirls black and white with Black Sabbath, Jack White and The Black Keys," Lollapalooza founder Perry Farrell says in a press release. "Two electronic acts, Justice and Avicii, will be presented on the main stages ... Can it get any heavier in the park?"


Greening efforts instituted last year to make the festival more sustainable appear to have been carried over to 2012. These steps include a recycling program that rewards attendees for participation, solar energy to power stage events, water-filling stations and an extensive composting system. 


"We have about 20 stations in the food courts where we have a compost manager and we have stations where there's a landfill container, recycling and compost, and we have a person standing at each one of those stations directing people on what to do," a rep for the festival said last year. 


Based on early ticket sales, organizers should expect another healthy year for attendance. Discounted souvenir and early bird three-day passes priced at $75 and $200 have already sold out. A regular three-day pass is available for $230.


You can check out the entire Lollapalooza lineup by visiting the official website here.

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

2012 Lollapalooza lineup features Red Hot Chili Peppers, Black Keys
Three-day music festival in Chicago to host more than 120 bands.