What is your 'tub soundtrack' when you want something other than whale sounds? I've been using Enigma's first three CD's lately, sometimes the soundtrack to the 70's movie 'FM'.
Bathrooms are echo-ey environments. It suits echo-ey music, like lots of devotional music written for churches (big echo-ey stone buildings) or Pink Floyd (written for people on acid or peyote).
I currently favour Fleet Foxes.