I'm a big fan of stonerrock and doom, and a lot of bands within those genres have a tendency to remain pretty much the same, musically, lyrically and atmospherically. Bands like orange goblin, fu manchu, nebula, weedeater, acid king, bongzilla, sleep, dopelord, conan, etc. do not change that much about their music over time. Which is fine by me, not all bands have to reinvent themselves to remain interesting to me.