I am always singing in th bathroom. It is the only time i have not been too embarrassed to sing.
Lol me too. Bathroom singing is a widespread phenomenon.
I have been told that I sing so loudly when I am in the bathroom that people cannot even hear the TV.
Bathroom singing
Bathroom singing, also known as singing in the bathroom, singing in the bath, or singing in the shower, is a widespread phenomenon. 
Many people sing in the bathroom because the hard wall surfaces, often tiles or wooden panels, and lack of soft furnishings, create an aurally pleasing acoustic environment. The multiple reflections from walls enrich the sound of one's voice. Small dimensions and hard surfaces of a typical bathroom produce various kinds of standing waves, reverberation and echoes, giving the voice "fullness
"...I really am not a musical theatre performer. I'm more an R&B singer and have been doing that my whole life. My mother is—well, was—also an R&B singer, in New Zealand...I was too busy wanting to sing backup or doing studio work singing chorus stuff, and singing backup for Gladys Knight in Vegas." Further, after her run in "Hairspray", she stated that she "...didn't know how to live in that world..." and so for several