The Roots, who just got added to the bill with Sheryl Crow of the July 4 Welcome America concert on the Parkway, will also be engaged in a residency at Atlantic City's Borgata, starting July 24. The Philadelphia hip-hop heroes, now the house band on "Late Night with Jimmy Fallon," will perform July 24 at the Borgata's 1,000 seat Music Box theater, with a special guest to be announced. After the show, drummer Questlove will spin at the Borgata's mixx nightclub. The group recently sold out the 7,000 capacity Festival Pier at their second annual Roots Picnic which also featured Public Enemy, TV on the Radio and Philly raised Santigold. Tix are on sale Saturday for the first July 24 show for $49.50 on the Borgata's web site. There will be several more shows with the second expected around Labor Day.