Two mainstays of classic rock are teaming up to hit the road starting July 11 in Tucson, Ariz. Chicago's roots date back to the late '60s, with the Doobie Brothers not far behind. Both bands have countless hits that are heard on any oldies/classic rock radio station any day of the week, and both seem to have tried to recapture their vintage sound in recent years. Should be a big hit for those old enough to remember, and their kids, and grandkids. Timeless music on a summer night? Can't miss! Don't miss - get your tickets now.