What is the fine-grained topic of the following text: Over the years, he’s appeared in spoken word concerts with a plethora of talents: most notably Charles Bukowski, Timothy Leary, Michael McClure, Macdonald Carey, Wanda Coleman, Robert Kelly, Ann Stanford, Dave Alvin, Henry Rollins, Edward Field, Gerald Locklin, Jim Carroll and Jello Biafra. Only return the topic.
Person's collaborations in spoken word concerts.