With the discovery of sound waves in the CMB, we have entered a new era of precision cosmology in which we can begin to talk with certainty about the origin of structure and the content of matter and energy in the universe.
Wayne Hu

The Sound Of Gravitational Waves, is located in the archive section of this forum for further considerations.

http://lisa.jpl.nasa.gov/SCIENCE/p5_e0.2_i25_a0.95_hp.wav

Lisa is opening a New Window on the universe too.

Dialogos of Eide