Re: Gilbert Sorrentino. STEELWORK is indeed an fine novel, as is ABERRATION OF STARLIGHT. SPLENDIDE-HOTEL, too, though it is escape genre; not fiction, not poetry, not essay, not abecedary (though formally it resembles one).
Also, his son Christopher Sorrentino has written a fascinating if at-times overly schematic novel about a fictional rock band, circa 1982, entitled SOUND ON SOUND.
And isn't it Barthelme who in, THE DEAD FATHER, likens listening to Stockhausen to whipping down a water slide lined with razor baldes and landing in a pool of rubbing alcohol?
Finally, members of the AEC -- Lester Bowie and Roscoe Mitchell, IIRC -- appear as "actors" in Rafi Zabor's otherwise entirely fictional THE BEAR COMES HOME.