In order to control the noise level of concerts in the park, New York since 1986 has required performers to use city-provided equipment along with a city-provided sound technician.

Mr. Hytner also understands that a much-peopled play requires performers who can put a strong stamp on their characters without extensive solo stage time.

To make any effect at all, it requires performers who can bewitch audiences with their dancing.

They require performers with the vocal resources of opera singers and the text-projection skills of Broadway songsters, a rare combination.

Also, regulations requiring performers to permanently reside in Cuba have been relaxed and artists are allowed to settle abroad, provided they do not break with the regime.

One play that requires intrinsically funny performers is "Waiting for Godot."

And whereas misty scrims or blurry camera work can turn actors into shadowy presences, the kinetic art of dance requires performers to be visible and in motion.

There was an economic advantage for Western pornographers to produce bukkake films since they only require one actress, and often amateur male performers whose pay-rates are low.

Multimedia works do not usually require performers.

Allevi retorted later in the same newspaper, accusing Ughi of "defending the caste", adding: "my music speaks to people's hearts but its technical and rhythmical virtuosity requires highly-talented performers".