This summer, Philly's classic rock fans can look forward to a show that will make them smile, courtesy of Chicago and the Doobie Brothers.

The classic rock stalwarts recently announced a co-headlining tour that will bring both to BB&T Pavilion in Camden on Friday, July 21. Tickets for the show, presented by 98.1 WOGL, go on sale at 10 a.m. Monday, Jan. 9, on the LiveNation site.

The tour kicks off June 7 in Conord, Calif., and wraps up for both bands on July 30 in Virginia Beach, Va. After that, the Doobie Brothers will shove off to Australia, New Zealand, and Japan for the year, while Chicago plans to play a series of U.S. solo dates through February and March.

"We know from past experience what a great show this is going to be for the audience," said the Doobie Brothers' Tom Johnston of the tour in a statement. "I'm sure there will be some fun musical surprises along the way too."

Chicago, originally known as Chicago Transit Authority, broke into the music industry in 1969 with the eponymous Chicago Transit Authority, featuring hits like "Does Anybody Really Know What Time It is?" and "Questions 67 and 68." They released Chicago XXXVI: Now, their 24th studio album, in 2014.

The Doobie Brothers came along a little after Chicago, releasing their own eponymous debut in 1971. Their latest album, Southbound, also saw a release in 2014.