Tom Petty and Red Hot Chili Peppers will join the Lumineers, Foster the People, Vampire Weekend and a host of other acts at the second annual Firefly music festival in Dover this June.

Festival organizers announced the complete line up this morning on   Other acts include Yeah Yeah Yeahs, the Avett Brothers, Passion Pit, MGMT, and Imagine Dragons.  This year the festival runs from June 21-23 on the grounds of the Woodlands at Dover International Speedway.  You can find a full list of 71 artists on the festival schedule on the Firefly website, fireflyfestival.com.

Early bird tickets will go on sale on Thursday.  Camping is also available on site.  

The 87 acre site in central Delaware drew about 30,000 people to the inaugural festival last summer for acts like The Killers and The Black Keys.  Strong attendance numbers encouraged organizers to make the festival an annual event.  

"After a highly successful inaugural event, we are excited to welcome Red Frog Events' Firefly Music Festival back to the Woodlands at Dover International Speedway," said Michael Tatoian, COO of Dover Motorsports, Inc.  "After watching last year's event blossom into a premier music festival, we're excited to again partner with Red Frog in expanding on the success of year one and make the second annual event even better."

Last summer, the Delaware Tourism Office expected the festival to generate more than $12 million for the local economy, with hotel and restaurants filling up with music fans.  Billboard Magazine reviewed the festival last year, calling the event "surprisingly devoid of on-site hiccups" for the first year festival.