100 years after Einstein predicted that the Universe has a song, we have finally heard the first sounds of the Universe. Astrophysics professor Julie Comerford takes us on a tour of the gravitational waves -- which are waves in space itself, akin to sound waves -- that are produced by colliding black holes, exploding stars, and the Big Bang. The first gravitational waves were detected in 2015, and they have opened a new window on our understanding of the Universe and already led to massive surprises. Julie Comerford is an Assistant Professor of astrophysics at the University of Colorado, Boulder. She uses telescopes such as the Hubble Space Telescope to study colliding galaxies and their supermassive black holes.