The blues is/are like zen. Words alone cannot capture it. Yet we have only words here on the mudcat. We have inference: "Have you ever been mistreated?" "My door key don't fit no more.", etc. We have diagrams: "12 bars,..", etc. We have John Lennon's "chair".
I have seen a dredlocked, technically adequate, young man play a National guitar and sing in the Taj Mahal manner. Yet his voice did not convince me that he had lived the emotionality he portrayed. He may in time.
Some are actors when they sing the blues. In all art there is the artist and the audience. Both must know and feel the blues for the transmission to reach. Arbitration is not possible. IMHO fortunato