Sources and scientific references: Sound waves driven by a supermassive black hole and heating of the Perseus cluster’s gas: Fabian et al. (2003), A Deep Chandra Observation of the Perseus Cluster: Shocks and Ripples https://arxiv.org/abs/astro-ph/0306036 The “singing comet” and magnetic oscillations detected by Rosetta: Richter et al. (2015), Observation of a New Type of Low-Frequency Waves at Comet 67P/Churyumov-Gerasimenko https://angeo.copernicus.org/articles/33/1031/2015/ Pulsar radio signals, rapid rotation and spin-up through mass transfer from companion stars: Lorimer (2008), Binary and Millisecond Pulsars https://arxiv.org/abs/0811.0762 LIGO’s first detection of gravitational waves, merging black holes and the rising “chirp” signal: Abbott et al. (2016), Observation of Gravitational Waves from a Binary Black Hole Merger https://arxiv.org/abs/1602.03837 Primordial sound waves and their surviving imprint on the distribution of galaxies: Eisenstein et al. (2005), Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies https://arxiv.org/abs/astro-ph/0501171