The blues - that is a feeling that makes you feel very bad. The blues'll give you sickness - from there's a pain you've never had. Now here's the way the blues go - it'll jump on you early in the morning. It'll worry you 'til you go to sleep. Then after you fall to sleep, you get to dreamin' them bad old dreams and it give you nothing but the bad old midnight creeps - Lightnin' Hopkins', spoken intro to Blues Is A Feeling