A recent study from the American Psychiatric Nurses Association showed that karaoke had a positive impact on... patients with a psychiatric condition.
As surprising as it sounds, one karaoke night a week statistically proved to reduce the amount of medication necessary and the level of stress for the patients involved.
They also started to be more involved in group therapies.
Although less developed in occidental countries, this practice has been approved in several psychiatric centers and youth centers in Japan where karaoke originates.
Source: http://www.medscape.fr/voirarticle/3601070