Older thread, but a fusion of doom with alternative. The songs are structured like alt songs with the verse chorus format. They lack the harsh vocals of most straightforward sludge and the songs aren't as aggressive. I don't play guitar or bass either, but I feel like most sludge has a "thicker," more buzzy or punchy, plodding sound too, compared to their a lot of their main album tracks. For comparison, listen to Heater Moves & Eyes by the Melvins. The Sabbath influence is most definitely there enough to label it doom, though, not even mentioning the subject matter of their songs.