In the 2020s, the “doom” or “sludge” tag is increasingly self-applied, as an ethos as well as an aesthetic, by bands who create oppressive, cathartic music intended as a reflection of our dismal times. Such are the three bands – Body Void, SERAC, and Everlasting Light – playing Davenport's Raccoon Motel (315 East Second Street) on Friday, December 8.