If you like your rock 'n' roll mixed with an exciting blast of horns there is no better listen than the music group Chicago. Formed in 1967, the band produced a steady stream of hits through the 1970s and 1980s. Billboard Magazine ranked Chicago ninth on the list of 100 Greatest Artists of All Time in terms of chart success. Gary Wenstrup traces the arc of the group's career from early rock 'n' roll successes like "25 or 6 to 4" and "Saturday in the Park" to their softer hits like "If You Leave Me Now" and "Hard to Say I'm Sorry." These fan favorites play in our minds forever.