From Wikipedia (2 Sep 2014):
Nelson is active in a number of issues. Along with Neil Young and John Mellencamp, he set up Farm Aid in 1985 to assist and increase awareness of the importance of family farms, after Bob Dylan's comments during the Live Aid concert that he hoped some of the money would help American farmers in danger of losing their farms through mortgage debt. The first concert included Bob Dylan, Billy Joel, B.B. King, Roy Orbison, and Neil Young among many others, and raised over $9 million for America's family farmers. Besides organizing and performing in the annual concerts, Nelson is the president of the board of Farm Aid.