Here's your daily look at 'Today in Rock History' featuring: Bruno Mars is 34. Nick Cannon is 39. WWE superstar The Miz is 39. Johnny Ramone was born on this day in 1948. Today in 1871, the three-day Great Chicago Fire touched off after Mrs. O'Leary's cow supposedly kicked over a kerosene lantern. 300 people were killed, 17,000 buildings were destroyed, and 99,000 people were left homeless.