2014 Rock 'n' Roll Philadelphia Half Marathon

Philadelphia is just one of the 26 North American Cities that hosts Competitor Group’s Rock ‘n’ Roll Marathon series. Around 20,000 runners participated this year in Philadelphia. The marathon features fourteen stages with live music at every mile along the course. A variety of artists provide a diverse mix of music that is meant to motivate and encourage runners as they complete a long distance run. (Abi Reimold / Philly.com)