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The Improv was created in 1963.
Improv Asylum was created in 1998.
Improv is short for improvised meaning made up on the spot.
In music (typically jazz), an improv is a solo that is not written in the music.
In comedy, improv is when a comedian comes up with things as they go.
Washington Improv Theater was created in 1986.
Philly Improv Theater was created in 2005.