Jay Allen Zimmerman’s Incredibly Deaf Musical is one of those shows that makes you grateful DC now has its own Fringe Festival. Because Zimmerman’s story is one that everyone in the city deserves to hear. Pardon my presumptuousness. It’s one that everyone deserves to see, to feel and to experience. Zimmerman is deaf, or at least “mostly deaf” in the Miracle Max sense of the phrase. He cannot hear speech, but can absorb some music…