Short answers, pulled from the story.
Hedwig Gorski coined the term performance poetry. The Austin Chronicle first published the term in 1982 to describe her work with composer D'Jalma Garnier III. Gorski had already been using the term herself to describe a 1978 work titled Booby, Mama!, a conceptual spoken poetry piece for five voices.
Performance poetry traces its origins to the Cabaret Voltaire in Zurich, where Hugo Ball performed one of the first sound poems, Gadji beri bimba, on the 23rd of June 1916. The source identifies Zurich as the actual birthplace of performance poetry.
Def Jam, the hip-hop recording company helmed by Russell Simmons, created a television show showcasing performance poets that ran on HBO. A separate stage production ran on Broadway for almost a year and won a Tony Award.
Poet Marc Smith founded the Poetry Slam as a competitive live performance format in Chicago. Smith is named alongside Bob Holman in New York and Alan Kaufman in San Francisco as a chief proponent of the open mic and slam forms.
The National Endowment for the Arts originally placed performance poetry within the theater category, which made poets without print publications ineligible for literary fellowship funding. Audio cassettes were not accepted as sample material. The NEA later corrected the classification to literature and began accepting audio recordings that have no printed versions of the poems.
East of Eden Band produced music and poetry collaborations that allowed cassettes of live radio broadcast recordings to circulate alongside popular underground music on radio stations worldwide. Gorski's approach, writing poems specifically for performance with music composed to fit those poems, is identified in the source as the defining model for the third and most popular type of performance poetry.