Mos Def next to a sign reading MOS DEF

Mos Def stands near the words MOS DEF at the Rock The Bells festival on July 19, 2008 in Chicago, Illinois. Rock the Bells was a touring hip-hop festival which stopped that year at Chicago's First Midwest Bank Amphitheater. Mos Def was born Dante Terrell Bay in 1973, so he turned 35 the year this photo was taken. Three years later, in 2011, he changed his legal name to Yasiin Bey.