Hi, geo-man. Pete Seeger is a must-listen, not only for the music, but for the history. He's part of "folk-music royalty" family that includes Charles Louis Seeger, Ruth Crawford Seeger and Peggy Seeger (his half-sister). You might want to check out
http://www.pegseeger.com for a little family history). Pete's one of the last links between the Woody Guthrie generation (he sang with Woody for several years), through the '50s communist scare and the blacklistings (read about the history of the Weavers--it's hard to believe things like that used to go on), to the '60s folkies like GL, Phil Ochs, Dylan and others, and has carried his musical activism up to the present time. He's a great environmentalist, and has written and performed songs that you DO know, whether or not you know they are his. I briefly met the man a few years ago; he's certainly slowed down by age (he must be in his upper 80s at this point), and doesn't really sing anymore (although he can lead a mean sing-along). Through his life and his music, whether or not you agree with his politics, he has given more to this country than just about anyone from the 20th century, and in his own way has been a great patriot.
DQ