Dolly Parton, Willie Nelson and Terri Clark will take part in the CMT 100 Greatest Duets concert to be held June 8 in Nashville. The concert taping will feature live performances of the Top 12 songs, and the full documentary is scheduled to premiere on CMT in September. Previously announced artists include Kenny Rogers, Trace Adkins, Montgomery Gentry, Clint Black, Lisa Hartman Black, Lee Ann Womack, Joe Nichols, Shooter Jennings, Raul Malo, Miranda Lambert, Blake Shelton, Crystal Gayle, Travis Tritt, Marty Stuart and Rebecca Lynn Howard. Malo will also serve as music director for the concert special. Adkins and Clark will co-host the concert. Tickets are on sale now.