You need to trust me and just listen to this.
It's eerie and strange and a little scary and quite literally otherworldly. This is the sound of the radio emissions coming from Saturn, recorded by Cassini, and dubbed "The Music of the Rings" by Donald Gurnett, a physicist at University of Iowa. The video accompanying the audio explains the details, so I won't bother.
I stole this from the always interesting GM=tc^3: A Babe in the Universe. She thinks it's an indication of a black hole in the center of Saturn, and goes on to say planets may be "seeded" by black holes in the early formation of solar systems. Who knows, she might be right; she's certainly smarter than I am.
Here's a closely related picture (also stolen from GM=tc^3) of the aurora around Saturn's North pole (the image was captured by Casinni as well). This is the same phenomenon as the auroras powering the Northern Lights here on Earth. Both are caused by the strong magnetic fields surrounding the two planets. And those same magnetic fields produce radio signals, which in turn produce all that crazy music. They make the worlds sing.
Click it to enlarge it. It'd quite a beautiful picture.