If you're a Blues musician, these are the tunes you are required to know! Arranged in order of likelihood that you'll run into them at an open jam. Of course, with the caveat that there will be some differences depending on the area you live in. For instance, if you live in Mississippi you'll run into more Delta Blues; If you live West Virginia you'll find Piedmont Blues prevailing there; if you live in Texas, you hear more ZZ Top (nothing wrong with THAT!).