Explanation: Hypnosis is the hazy state in which intense concentration is generated. The state of relaxation and focus-orientation is felt by the person under the hypnotism. This state is achieved usually with the help of therapist and tools like repetition of words etc in repeated order.
The situation mentioned in the question states about the contestants being in the states of hypnosis because they are performing the singing act with focus even though they don't perform it in publicly.They are in trance-like state that can be signified as hypnotic state.
is a trance-like state in which you have heightened focus and concentration. Hypnosis is usually done with the help of a therapist using verbal repetition and mental images. When you're under hypnosis, you usually feel calm and relaxed, and are more open to suggestions.