What's the speed limit for sound? As I understand sound itself is not composed of particles that move themselves but a transfer of energy between particles which then oscillate and produce the sound phenomenon. If so do relativistic changes affect sound moving at high rates at all, as there really is no single particle that sound is contributed to. Could sound theoretically travel faster than light does in a vaccuum, under correct circumstances? Obviously sound can't travel in a vacuum but i'm thinking some super dense material. I hope this wasn't a question with some trivial, fairly obvious answer. ehehe.. Any educated replies will be much appreciated.