"Renewable" is a funny concept in and of itself.
Sound waves have energy, every time you use a microphone you're taking sound waves in the air and using them to "wobble" a magnet which induces a current in a coil. This is then amplified to be recorded.
The key word there is "amplified", however. A sound wave is like a very low-intensity explosion in that a sound wave radiates in all directions (well, an easier way to look at this is dropping a rock in a pond). There's no way to capture all of that expended energy and get it back. The mechanics of it as well as entropy say, emphatically, "no."
