Watch the Blues for Two online guitar lesson by Mimi Fox from Jazz Performance
When you have amassed a library of great blues recordings by some of the artists I have mentioned (and others of your choosing), you will hear thematic development through the lyrics and cadence of the vocals. The best way to tell a compelling story (in this case as an instrumentalist) is to learn to phrase as a vocalist would. Remember that the human voice and our heart beats were the first instruments! When I am soloing, I often hear lyrics in my head which grounds me in the original meaning of the piece. This is important!