Musicians Emmy Lou Harris, left, and Rodney Crowell perform at "Play It Forward: A Celebration of Music's Evolution and Influencers" at the Grammy Foundation's 15th Annual Music Preserv

 

              Musicians Emmy Lou Harris, left, and Rodney Crowell perform at "Play It Forward: A Celebration of Music
Musicians Emmy Lou Harris, left, and Rodney Crowell perform at "Play It Forward: A Celebration of Music's Evolution and Influencers" at the Grammy Foundation's 15th Annual Music Preservation Project, Thursday, Feb. 7, 2013, in Los Angeles. (Photo by Vince Bucci/Invision/AP)