If you've ever wondered about the meaning behind Chicago’s hit song, "25 or 6 to 4," this decades-old mystery will be answered in Now More Than Ever: The History of Chicago, debuting from CNN Films on New Year’s Day. Director Peter Pardini explores Chicago’s fifty-year legacy through personal interviews with band members, rare footage and of course, their unforgettable music. 

Viewers can interact with CNN Films about Now More Than Ever by using the hashtag #HistoryOfChicago via Twitter before and during the premiere, airing on CNN at 8 p.m. ET on New Year's Day.