"After a noticeable silence, he'd recently published a book o..." — Denis Johnson quote meaning

After a noticeable silence, he'd recently published a book of technically baffling poems, with line breaks so arbitrary and frequent as to be useless, arrhythmic. On the page they look like some of Charles Bukowski's skinny, chatty, muttering-stuttering antiverses. Impossibly, Mark's words make music, the faraway strains of an irresistible jazz. It's plain to any reader, within a few lines—well, go read the poems and see, Marcus Ahearn traffics with the ineffable. He makes the mind of the speaker present, in that here-and-now where the reader actually reads—that place. Such a rare thing. Samuel Beckett. Jean Follain, Ionesco—the composer Billy Strayhorn. Mark calls his process "psychic improvisation" and referred me to the painter Paul Klee; the term was Klee's. "You just get out a pen and a notebook and let your mind go long," he told me.