In this column: Milk Cow Blues, meaning, Kokomo Arnold, earliest recording, Freddie Spruell, Sara Martin, Mean Tight Mama, Clarence Williams, Son House, My Black Mama, Mississippi Fred McDowell, Big Bill Broonzy, Robert Johnson, Milkcow's Calf Blues Well I woke up this mornin', Looked outdoors I can tell my milk cow, I can tell by the …