He went on tours in the 1960s and 1970s and played for many festivals such as the Festival of American Folklife in Washington , D.C. in 1972 , the Mariposa Fest in Toronto in 1974 , and the New Orleans Jazz and Heritage Festival in 1976 . He toured extensively during the 1960s and 1970s . He played many of the largest and best-known folk festivals , including the Smithsonian Festival of American Folklife in Washington , D.C. in 1972 , the Mariposa Fest in Toronto in 1974 , and the New Orleans Jazz & Heritage Festival in 1976 .