Byline: Fred Shuster Daily News Music Writer
There are many definitions for the blues. Perhaps Lightnin' Hopkins' version was among the best because he captured the humor often inherent in feeling bad.
``I went downtown and bought myself a pair of shoes/I didn't do it 'cause I needed them/Did it because I had the blues,'' the Texas bluesman sang.
Now, that's bad luck and trouble. When you're feeling so rotten you go out and buy a pair shoes you don't really need.
Despite many so-called blues revivals in the past, this year has proved to be the real thing, particularly in the Valley, where two new clubs devoted to the blues are doing well, a third has been a fi