The Roots [ tickets ], Fat Joe [ tickets ], Pete Yorn, Jermaine Dupri [ tickets ] and Yellowcard [ tickets ] are among the acts that have signed on to play free, spontaneous concerts this summer in secret locations throughout the U.S.

Details about the shows--dubbed "Flash Fusion Concerts"--will be announced at the "last minute," according to a press release. Those interested must register at the "Fusion Flash Concerts" website. Registered users will learn the identities of five additional acts scheduled to participate in the concert series, and will be notified when cities and dates for the concerts are announced.

Registration also affords users access to exclusive video footage, a tour blog, concert reviews, a "mash-up" remix contest hosted by ACIDplanet.com, 10 music downloads provided by Sony Connect, and the chance to win prizes including a new 2006 Ford Fusion sedan, Sony products and V.I.P. access to the shows, according to a press release.

"We're really excited to get this summer-long party started in New York," The Roots' ?uestlove said in a statement. "With our music fusing together an audience of hip-hop, rock, jazz and funk fans, we're a perfect fit for this one-of-a-kind concert series."

"There's a spontaneity factor unique to this concert series," Jermaine Dupri added. "The last-minute release of show details and ongoing interaction with fans really builds energy and excitement."

Plans are in the works to release a compilation album of participating artists. The disc will be available exclusively at the shows and at Target retail stores.

Sponsored by Ford Motor Company, the "Flash Fusion Concerts" series will, in part, hype the early fall launch of the car manufacturer's 2006 Fusion sedan.