Relaxation, Sleep, Stress Relief, Peaceful Piano Music This is soothing piano music with nature sounds, ideal for cat relaxation and sleep. Natural sounds, such as the sound of water, have a calming effect. When the brain perceives the '1/f fluctuation' of natural sounds, alpha waves are generated and the brain is told to relax, which is though to be effective not only for humans but also for cats. And this music is composed mainly of tones that cats tend to like. The soft piano tones and relaxing sound of water will soothe your cat and you.