Well, anything by this guy for me.
http://www.youtube.com/user/OfficialPatMcCurdy
Also I'd throw in the first album from The Bacon Brothers (yes, that would be Kevin and his brother). Bomshel for the country folk. Bond for the classical fusion folk. Alana Grace is pretty good. Ha Ha Tonka is good folk music (they did a great version of "Black Betty" at Summerfest but that's not on their album. Believe it or not, the Infant Sorrow album (Get Him To The Greek soundtrack) is really good, even if you don't like Russel Brand. Ed Kowalczyk of Live has a good solo album. Well, I kind of went off topic by listing albums or bands and not songs but all those songs on the albums are little known, right?