Half marathon rocks n' rolls

July 21, 2013 1:21:00 PM PDT
Some 20,000 people were on the run early in Grant Park for the fifth annual X Sport Fitness Rock n' Roll Chicago half marathon.

The race features 13 local bands performing at each mile along the course and the route allows runners to pass by many of the city's landmarks as they make their way.

This year, nearly two-thirds of the participants are female runners.