Isis (sometimes stylized ISIS) was an American post-metal band formed in Boston, Massachusetts in 1997. The band borrowed from and helped to evolve the post-metal sound pioneered by bands such as Neurosis and Godflesh, characterized by lengthy songs focusing on repetition and evolution of structure. Isis's last studio album, Wavering Radiant, was released on May 5, 2009. Isis disbanded in June 2010, just before the release of a split EP with the Melvins. In 2018, the group reformed as Celestial for a one-off show to pay tribute to Caleb Scofield.