On both sides of the stage improv-comedy"s popularity has increased exponentially throughout the 1980s and "90s and into the new millennium. Presto! An original song is created out of thin air. With nothing but a suggestion from the audience, daring young improvisers working without a net or a script create hilarious characters, sketches, and songs. Thrilled by the danger, the immediacy, and the virtuosity of improv-comedy, spectators laugh and cheer. American improv-comedy burst onto the scene in the 1950s with Chicago"s the Compass Players (best known for the brilliant comedy duo Mike Nichols and Elaine May) and the Second City, which launched the careers of many popular comedians, including Gilda Radner, John Belushi, and Mike Myers. Chicago continues to be a mecca for young performers who travel from faraway places to study improv. At the same time, the techniques of Chicago improv have infiltrated classrooms, workshops, rehearsals, and comedy clubs across North and South...