Improvisational theatre, also known simply as improv, is a form of Performance Art. http://en.wikipedia.org/wiki/Improvisational_theatre
Musical improvisation (also known as musical extemporization) is the creative activity of immediate ("in the moment") musical composition, which combines performance with communication of emotions and instrumental technique as well as spontaneous response to other musicians. Thus, musical ideas in improvisation are spontaneous, but may be based on chord changes in classical music, and indeed many other kinds of music. http://en.wikipedia.org/wiki/Musical_improvisation (Jazz, Syncopated Music)
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