Tickets for the 15th Annual Farm Aid concert will go on sale Friday (Aug. 4) at 10 a.m. at all Ticketmaster outlets. Pavilion tickets are $42.50 and lawn seats are $27.50. A limited number of "Corn Belt" seats will be offered for $65. Founders Willie Nelson, Neil Young and John Mellencamp will headline the all-day show Sept. 17 at the Nissan Pavilion outside Washington, D.C. Joining them will be a variety of acts from all music genres including Travis Tritt, Barenaked Ladies, Jimmy Sturr and Arlo Guthrie. The show's main aim is to raise money and awareness for the hardships of American farmers. So far the event has generated $15 million for more than 100 farm organizations, churches and service agencies. To celebrate the benefit's 15th year, a double-CD compilation of Farm Aid moments from past shows will be released Sept. 12, with all proceeds going to the cause. Farm Aid 2000 will be carried live on CMT from 2 - 10 p.m. ET.