There are at least two artists named ‘inertia.’: 1. inertia. is an ambient music producer from the United Kingdom. 2. Inertia. started out in 2011 as a crust/hardcore project between Ryan Treppedi of Hollow-Eyed and Stephen Dzikowski of Departures. In 2014 Jillian Keats and Tony Bones of IDES were added to fill out the lineup and turn the project into an active band. Inertia. constantly seeks evolution and growth in their music.