The reunited SOUNDGARDEN has confirmed that it will be one of the headliners of this year's Lollapalooza festival, set to take place August 6-8 at Grant Park in downtown Chicago.In a posting on SOUNDGARDEN's official web site, the four members of the band — vocalist Chris Cornell, guitarist Kim Thayil, bassist Ben Shepherd and drummer Matt Cameron — write, "SOUNDGARDEN will be one of the headliners at this year's Lollapalooza festival. We hope to see you all on August 8th at Grant Park, Chicago Illinois." According to Greg Kot of the Chicago Tribune, promoters will on Tuesday (April 6) confirm the Lollapalooza 2010 headliners as previously reported via various news sources: SOUNDGARDEN, LADY GAGA, GREEN DAY, ARCADE FIRE, THE STROKES and PHOENIX. They will also announce the remainder of the 124-artist lineup for the three-day event. Tickets ($190 for three days until they sell out, then $215) are available at Lollapalooza.com. The complete lineup can be found below. SOUNDGARDEN's involvement with Lollapalooza has been rumored since early this year, when a cryptic announcement from singer Chris Cornell seemed to indicate that the band was returning after a 13-year hiatus.