In this Dec. 4, 2013 photo, Aaron Pritchard replaces grass after laying a headstone on the previously unmarked grave of blues musician Aaron Sparks in Crestwood, Mo. Pritchard is part of the Killer Blues Headstone Project, a nonprofit effort to posthumously honor sometimes long-forgotten blues musicians with grave markers. The group has laid 22 headstones to date, with several more complete but awaiting placement. (AP Photo/Jeff Roberson)