Charlie Daniels, Emmylou Harris, Vince Gill and Craig Wayne Boyd of `The Voice' on Tap for Summer NAMM in Nashville
![Charlie Daniels, Emmylou Harris, Vince Gill and Craig Wayne Boyd of `The Voice' on Tap for Summer NAMM in Nashville](http://www.billboard.com/files/styles/promo_225/public/media/charlie-daniels-cma-fest-performance-2016-billboard-1548.jpg)
Summer NAMM, the mid-year trade show for the $17 billion music and sounds products business, comes to Nashville June 23-25 with veteran and rising...