It isn't folk. It isn't country. It isn't blues. Or is it? Once upon a time there was Peter, Paul and Mary and they taught harmony at the hometown school of folk music. Joni raised the bar, and Bonnie barged in with a bottle and said, "Hey, give me a shot of soul and let's drink to Janis!" and Joan and Judy were left waiting for the train to Whataboutusville as the rest of us went sailing off into the Wild Blue. Now: Let's sing it together (in harmony): Swing Low, Sweet Internet