Improvisation in the performing arts does not belong to jazz alone. Think of Chopin, Jackson Pollack, Martha Graham, Richard Pryor. Think, also, of Edward Albee. The playwright who won a Lifetime Achievement Tony Award a few weeks ago uses his improvisational ability in his teaching when he invents characters suggested by his students.
“Everything I do is unrehearsed, spontaneous, and I have to invent it as I go along,” Albee says in an interview that you can see here. The interview clip precedes others of Albee demonstrating. You watch a great playwright write by acting. Some of his attempts work better than others (like jazz solos), but they’re all interesting glimpses inside a creative mind.