I’ll just quote from the Kohler website:
Music moves us. It drives us. It is an undeniable force resonating throughout our lives. VibrAcoustic technology brings the transformative power of music into the bathroom, combining music with water for a bathing experience like no other.
With VibrAcoustic technology, you can play your favorite music, news, podcasts and more through your bath. Just plug in your smart phone, tablet or MP3 player or stream wirelessly via Bluetooth®*.
Fill your entire bathroom with your favorite song, in high-quality sound, while you get ready for an anticipated evening. Or relax in the bath as vibrations from the music surround and soothe you.
The whole story (and plenty more examples including a video) here.