Def Leppard and Journey are going on tour next year. The rock bands announced a new North American stadium tour yesterday. The 23-city tour kicks off July 6 in St. Louis and concludes Sept. 8 in Denver. Steve Miller Band, Heart and Cheap Trick will appear as special guests on select dates. Tickets go on sale Dec. 15 at 10 a.m. local time, with pre-sales for Citi card members to begin Dec. 13 at 10 a.m.