The shower, with its cocoon of privacy and great acoustics, brings out the diva in all of us. So take the steamy stage and sing away!!! Besides being good clean fun, singing enhances immunity by increassing antibodies that fight sickness, according to one German study. 
Music therapists believe that singing also boosts your mood. 
So whether your style is a belty Ethal Merman or a breathy Britney Spears, sing your heart out and soak in songs’ health benefits.
http://www.prevention.com/health/