1) I'm a shower person all the way. Something about normal baths doesn't seem very sanitary to me (although I don't suppose you would prefer a bath if you were covered in filth).

2) I shower on a daily basis, unless something happens which prevents me from doing so. My hair gets kind of afro-ish if I don't wash it on a regular basis.

3) Singing in a shower? Sure, I do that. The accoustics are great in the bathroom.

4) Not to sound full of myself, but definitely 10/10. I've gone through years of training, and have had lead roles in quite a few Operas.

^^;