When I'm on stage, it's a little world I've created where I'm sort of the thing, so I have total control over everything that happens. When we're improvising, I'm with someone I totally trust. I know things are going to work out. I don't have those guarantees in life. There are no consequences on stage.
— Colin Mochrie

When we were doing 'Freaks and Geeks', I didn't quite understand how movies and TV worked, and I would improvise even if the camera wasn't on me. I thought I was helping the other actors by keeping them on their toes, but nobody appreciated it when I would trip them up. So I was improvising a little bit back then, but not in a productive way.
James Franco improvising quote

Jazz vision is the fusion of music and art a real paradox of same-yet different. Here we play in exchanges, like the hardness of the key of c# major and from the softness of Db major - capturing, reflecting and improvising.
— Barbara Januszkiewicz

There was one thing Beethoven didn't do. When one of his string quartets was played, you can believe the second violin wasn't improvising.
— Wynton Marsalis

When I worked with Robin Williams, now there is improv! He is just as funny as you think he is. We did at least five or six takes of every scene, improvising every scene differently. He was a riot.
— improvising quotation by Stephen Root