John Mayer speaks on stage at the 28th Annual Rock and Roll Hall of Fame Induction Ceremony at Nokia Theatre L.A. Live on April 18, 2013 in Los Angeles, California.

The Roots tapped as house band for third annual July 4 extravaganza.

The Philly 4th of July Jam will bring fireworks and a slew of high-profile performers to Philadelphia this Independence Day, with John Mayer, Jill Scott and Demi Lovato among the top talent at this year's ceremony. The Roots will serve as the house band for the hometown celebration, which will be simulcast this year on VH1 and Palladia from 8-11 pm ET.

Rounding out this year's bill is Ne-Yo, Grace Potter and J. Cole, along with an impressive fireworks display over the Philadelphia Museum of Art. The Philly 4th of July Jam is billed as the "largest free concert in America," with hundreds of thousands flocking to the city's Benjamin Franklin Parkway to watch the show.

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"The City of Philadelphia is proud to join with VH1 and Palladia in welcoming an incredibly talented group of musicians to our city this Fourth of July," says Philadelphia Mayor Michael A. Nutter in a press statement. The July 4 concert will be part of the weeklong "Welcome America!" festival, sponsored by regional convenience store giant Wawa.

After canceling his tour last year due to vocal problems, Mayer will appear at the Independence Day ceremony before his "Born & Raised" summer tour kicks off on July 6 at Summerfest in Milwaukee. Last year's Philly 4th of July Jam included the Roots, Queen Latifah, Common and Joe Jonas.