Murray, if you're doing Rodgers & Hammerstein in the shower [now, THERE's and image!], you can't leave out "I'm Gonna Wash That Man Right Out Of My Hair."
Amos, you're right about how great the acoustics make your voice sound. ["One's voice," that is--I've never heard "yours" in the shower.] My shower makes me sound so good that I tried recording in there. Unfortunately, it shorted out my amp and ruined a perfectly good Shure SM58!