Tool have signed on to join the main stage lineup for Summerfest along with Toby Keith, Def Leppard, The Fray, Roger Waters and John Mayer. The band will play the Marcus Ampitheater in Milwaukee, Wisconsin on July 4th with tickets going on sale May 5th. Other acts along for Summerfest include The Goo Goo Dolls, Los Lonely Boys, Lifehouse and Jay and Silent Bob-favorite, Morris Day & the Time. Stages and grounds are still to-be-disclosed.http://www.roadrunnerrecords.com/blabbermouth.net/news.aspx?mode=Article&newsitemID=71226