NASA has released sounds of saturn recorded by the cassini-huygens mission. the radio emissions from saturn are closely related to the auroras near the poles of the planet so they are related to the planet's magnetic fields.
scientists did some messing around with the radio emissions recorded from saturn so that they are actually audible to the human ear. listen here
as space.com points out, saturn sounds an awful lot like the 1956 science fiction movie Forbidden Planet.