John Hammond championed traditional Delta blues when others ignored it. Then after four decades of performing, he shifted gears and turned his considerable talent to gritty contemporary songs. Odetta's influence on American music is hard to overstate; Janis Joplin and Bob Dylan are just two of many who have credited her as a major influence. An original member of the Jefferson Airplane and Hot Tuna, Jorma Kaukonen is a student of traditional American music, especially the Rev. Gary Davis.