I love to sing in the shower!
me too! its so much fun and i always sound amazing! its pretty much a widespread pheomenon.
Do many people sing in the shower?
Yea, theres a ton that do it. Its because the surrounding of the walls and lack of soft furniture makes it sound better then it really is.
Oh I wondered why I sounded better in there!
Its true. Its because the small dimensions produce a type of standing wave that echoes, giving our voice more depth and fullness
Bathroom singing
and depth."
This habit was reported (with an attempt of explanations) centuries ago. For example, Ibn Khaldun in Chapter 1 of his "Muqaddimah" writes:
The bathroom singer is an ironic reference to mediocre or amateur singers.
Jon Anderson had tiles installed in the studio, to simulate the echo effect of one's vocals in a bathroom.
This effect was not used only by singers. Paul Simon wrote:
"Weird Al" Yankovic in fact in 1979 recorded his first single,
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