K-Ci & JoJo, 'N Sync, Olivia Newton-John Added To Benefit Show

K-Ci & JoJo, 'N Sync and Olivia Newton-John have joined the line-up for the PAX benefit concert scheduled for May 31 at Radio City Music Hall.

Proceeds from the show, which will also include performances by the previously announced Mariah Carey, Matchbox 20 and Paula Cole (see "Mariah To Join Paula, Matchbox 20 For Benefit"), will go to PAX, a non-profit organization dedicated to halting gun violence in the U.S.

PAX was founded two years ago by Talmage Cooley and Daniel Gross, whose brother, Matthew, played in the Bushpilots before being injured during the shooting at the Empire State Building observation deck in February 1997.