Apparently the folks at Kohler are all about singing in the shower. As I recall, they were one of the first to introduce sound integration into the shower with their DTVI & DTVII controls, which allowed you to control music, light, and water from a single digital control inside the shower.
Then, a couple years ago, they introduced their VibrAcoustics bath line, which incorporates into the tub a “soothing sound vibration technology that resounds throughout your body to relax and calm you like never before.”
And now they’ve come out with the Moxie Showerhead + Wireless Speaker. A showerhead and integrated removable speaker that syncs to your media player via bluetooth technology.