Ralph Ellison was a jazz trumpeter and lover of jazz in general.  It was Ellison who said that "American life is jazz-shaped."  He then went on to demonstrate this when he wrote, "The Invisible Man."  Ellison wrote a lot about jazz and included references to jazz in many of his works, but in "The Invisible Man," he was writing IN jazz.

Ellison’s work is essential to those of us in search of a jazz-based faith because Ellison demonstrates for us that while jazz is mainly known as a music–jazz is more than music–and perhaps we can believe IN jazz.