In this timely and temperamental critical performance, Maria Damon celebrates our brave new postliterary world as a thing of the past. Before neighborhood slam and Flarf spam — the “diaspora poeses” of contemporary America, treated in the second half of this essay collection — there was a beat culture in postwar San Francisco that did more than Howl. In the “shadowland,” beyond the floodlight of Allen Ginsberg’s expressive iconicity, jazz, poetry, and performance communities thrived in a tenuous relation to the literary.